U. Ghatak

发表

Condensed cyclic and bridged-ring systems : part 12: a novel synthetic route to 4-p-methoxyphenyl-bicyclo[ 2.2.2 ]octan-2-ones and some bicyclo [ 3.2.1 ] octane derivatives by acid-catalyzed intramolecula

S. K. Patra, R. Dasgupta, Pranab R. Kanjilal, 1985 .

Synthesis of polyglutathione, polyasparthione, and related sequential polypeptides.

J. Kovács, U. Ghatak, C. Kalita, 1972, The Journal of organic chemistry.

A novel route to functionalized linearly benzannulatedmedium ring carbocyclics through regioselective aryl radical cyclization

U. Ghatak, K. Ghosh, 2013 .

Regioselective Aryl Radical Cyclisation. Part 2.1 Synthesis of Octahydro-1H-Dibenzo[a,d]Cycloheptenes Through 7-endo Ring Closure

U. Ghatak, Anusree Ghosh, J. Mukhopadhyaya, 1997 .

A highly regioselective 6-endo-aryl radical cyclisation: stereocontrolled synthesis of trans-octahydroanthracenes

A. K. Mukherjee, M. Mukherjee, U. Ghatak, 1991 .

B. Green, G. Pettit, T. R. Kasturi, 1962 .

Synthetic studies on resin acids—V : Synthesis of three isomers of dehydroabietic acid

P. Dutta, U. Ghatak, Monalisha Sharma, 1963 .

The Correct Structures of the ortho-Cyclized Products in the Cycloalkylations of 1-m-Methoxybenzyl-4,4a,5,6,7,8-Hexahydronaphthalen-2(3H)-One and 1-m-Methoxybenzyl-Octalins : X-Ray Structure Determination of (±)-4-Methoxy-9a-Carbamorphinan-16-One

A. K. Mukherjee, M. Mukherjee, U. Ghatak, 1992 .

Synthesis of (±)-2-Methoxy-9a-Carbamorphinan and (±)-2-Methoxy-9a-Carba-14α-Morphinan: Acid Catalyzed Cyclizations of 1-m-Methoxybenzyl-4, 4a,5,6,7,8-Hexahydronaphthalen-2(3H)-ONE and 1 -m-Methox Ybenzyloctalins

Sarbani Pal, S. Ghosh, B. Banik, 1990 .

SYNTHETIC STUDIES TOWARD COMPLEX DITERPENOIDS. 16. A NOVEL SYNTHETIC ROUTE TO O THE CARBOCYCLIC SKELETA OF STEMODIN AND STEMARIN BY ACID-CATALYZED INTRAMOLECULAR C-ALKYLATION AND REARRANGEMENT REACTIONS

S. K. Patra, Subrata K. Ghosh, Pranab R. Kanjilal, 1985 .

Synthetic studies toward complex diterpenoids. XVI: A novel synthetic route to the carbocyclic skeleta of stemodin and stemarin by acid-catalyzed intramolecular C-alkylation and rearrangement reactions

S. K. Patra, Subrata K. Ghosh, Pranab R. Kanjilal, 1985 .

Regioselective 9- aryl radical cyclisation: A new synthetic route to decahydro-5-dibenzo[a,d] and [a,e]-cyclononenols

U. Ghatak, K. Ghosh, 1995 .

Synthesis studies on resin acids—VII: Synthesis of two isomers of 4,10-dimethyldecalin-4-carboxylic acids☆

P. Dutta, U. Ghatak, N. K. Basu, 1965 .

Synthetic studies toward complex diterpenoids. IX. New stereocontrolled synthetic route to some intermediates for diterpenoid alkaloids and C20 gibberellins

U. Ghatak, S. Chakrabarty, 1976 .

Regioselective Aryl Radical Cyclization. 1. Stereocontrolled Synthesis of Linearly Condensed Hydroaromatic Carbocyclic Systems through 6-endo-Ring Closures

U. Ghatak, Sitaram Pal, J. Mukhopadhyaya, 1994 .

Regioselective 9-endo Aryl Radical Cyclization: A New Synthetic Route to Decahydro-5H-dibenzo(a,d) and (a,e)-Cyclononenols.

U. Ghatak, K. Ghosh, 1995 .

Regioselectivity in the intramolecular carbon–hydrogen insertion in metal-catalysed decomposition of some cis-1-methyl-3-arylcyclohexyl diazomethyl ketones. A highly efficient homogeneous nickel catalyst for carbenoid insertion

A. Chakraborti, J. Ray, U. Ghatak, 1984 .

Synthetic studies toward complex diterpenoids. Stereocontrolled total synthesis of some gibbane synthons and degradation products of gibberellins

U. Ghatak, Prabir C. Chakraborti, 1979 .

Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 2. A simple new synthetic route to octahydro-4,10a-ethanophenanthren-12-ones and octahydropentaleno[6a,1-a]naphthalen-4-ones

S. C. Roy, U. Ghatak, G. Satyanarayana, 1982 .

Acid-catalysed intramolecular C-alkylation in βγ-unsaturated diazomethyl ketones. A new synthetic route to angularly fused cyclobutanones, bridged cyclopentanones, and γ-lactones

Subrata K. Ghosh, U. Ghatak, G. Satyanarayana, 1981 .

Synthetic studies toward complex diterpenoids. 10. Stereocontrolled total synthesis of (.+-.)-19.alpha.,20.alpha.-(acetylimino)-12-hydroxy-5.beta.,10.alpha.-podocarpa-8,11,13-triene, a degradation product of atisine

J. Ray, U. Ghatak, S. K. Alam, 1978 .

Intramolecular C-alkylation in βγ-unsaturated diazo ketones: a new synthetic route to angularly fused cyclobutanones and γ-lactones

U. Ghatak, B. Sanyal, 1974 .

Synthetic studies towards complex diterpenoids—VI : New synthetic routes to tetracyclic bridged-bicyclo[3.2.1]octane intermediates by intramolecular alkylation reactions through α-diazomethyl ketones of hydroaromatic γ,δ-unsaturated acids

S. Dasgupta, Subrata K. Ghosh, R. Dasgupta, 1972 .

Carbon-carbon bond formation and annulation reactions using trimethyl and triethyl orthoformates

Subrata K. Ghosh, U. Ghatak, 1988, Proceedings / Indian Academy of Sciences.

Highly regioselective 8-endo-aryl radical cyclisation: a new synthetic route to decahydrodibenzo-[a,d]- and -[a,e]-cyclooctenols

A. Ghosh, U. Ghatak, K. Ghosh, 1994 .

First total synthesis of the novel cytotoxic benzocycloheptenes (±)-deoxofaveline and (±)-faveline methyl ether

Ajit K. Ghosh, A. Ghosh, U. Ghatak, 1992 .

An Expeditious Total Synthesis of (±)-Sempervirol, (±)-Sugiol and (±)-Xanthopherol Methyl Ether by Acid-Catalyzed Cyclialkylation Route

B. Banik, U. Ghatak, 1989 .

Influence of methoxy-and methyl-aromatic substituents on stereochemistry of the products in the acid-catalyzed cyclization of 2-(2-arylethyl)-1,3,3-trimethylcyclohexanols: stereocontrolled total synthesis of (±)-nimbidiol and (±)-nimbiol

B. Banik, U. Ghatak, Sukumar Ghosh, 1988 .

Synthesis and conformational analysis of tricyclic ring-C aromatic 20-norditerpenoid resin acid analogs

Richard E. Moore, A. Banerjee, N. R. Chatterjee, 1969 .

Influence of electron donating aromatic substituents on the ruthenium tetroxide-catalysed oxidation of (±)-podocarpa-8,11,13-trienes

U. Ghatak, Sukumar Ghosh, 1992 .

Investigation on the Sodium—Liquid Ammonia Cleavage of a Tosyl Protecting Group of Tosylamino Acids and Peptides1

U. Ghatak, J. Kovacs, 1966 .

Condensed cyclic and bridged-ring systems. Part 15. Acid-catalysed intramolecular alkylations in 1-diazoacetyl-1,2,3,4-tetrahydro-9-methoxy-1-methylphenanthrenes

B. Banik, U. Ghatak, Sitaram Pal, 1994 .

Racemization of amino acid derivatives. Rate of racemization and peptide bond formation of cysteine active esters.

R. H. Johnson, G. Mayers, U. Ghatak, 1970, The Journal of organic chemistry.

Polypeptides with known repeating sequences of amino acids. Comparison of several methods used for the synthesis of poly‐γ‐D‐ and L‐glutamylglycine and investigation of its serological reaction with antianthrax immune serum

U. Ghatak, J. Kovacs, G. N. Schmit, 1968, Biopolymers.

Synthesis of poly -glutamyl- -aminobutyric acids and their reactivity with antiserum against Bacillus anthracis polypeptide.

G. Senyk, D. Nitecki, G. Mayers, 1972, Biochemistry.

G. Pettit, U. Ghatak, A. Gupta, 1963 .

Synthetic studies towards complex diterpenoids—VII : Stereoselective synthesis and conformational analysis of all four possible racemates of 1,2,3,4,4a,9a-hexadydro-1-methylfluorene-1-carboxylic acids

R. Dasgupta, U. Ghatak, J. Chakravarty, 1974 .

Synthetic studies directed to gibberellins and related compounds

U. Ghatak, J. Chakravarty, Arijit Banerjee, 1968 .

Condensed cyclic and bridged-ring systems. VII. Acid-catalysed cyclisation of methyl substituted benzylcyclohexanols. Factors influencing the nature of cyclisation products

J. Ray, U. Ghatak, Jyotirmoy Chakravarty, 1977 .

Acid-catalized cylisation of substituted benzylcyclohexanols. Factors influencing the nature of cyclisation products.

U. Ghatak, J. Chakravarty, 1966 .

Rates of racemization and coupling of cysteine active ester derivatives

R. H. Johnson, G. Mayers, U. Ghatak, 1970 .

A simple synthesis of α, β-unsaturated aldehydes by 1,3-carbonyl transposition through one carbon homologation

R. Dasgupta, U. Ghatak, 1985 .

Regioselective intramolecular carbon-hydrogen insertion in copper-catalyzed carbenoid decompositions of cis-1-methyl-3-arylcyclohexane-1-diazomethyl ketones : some synthetic applications

J. Ray, U. Ghatak, D. Mukherjee, 1975 .

Angular alkylation through intramolecular carbenoid insertion. New stereocontrolled route to synthetic intermediates to the diterpene alkaloids and C20 -gibberellins

U. Ghatak, S. Chakrabarty, 1972 .

Synthetic Studies on Resin Acids. IV1

Dilip Datta, U. Ghatak, S. Ray, 1960 .

Influence of electron donating aromatic substituents on the stereochemistry of the products in cycloalkylations of 2-(2-arylethyl)-3,3-dimethyl-1-methylenecyclohexane and related substrates: mechanisms of aromatic cycloalkylations

B. Banik, U. Ghatak, Sukumar Ghosh, 1991 .

An Improved Total Synthesis of (±) - Podocarpic Acid by a Cyclialkylation Route

Pranab R. Kanjilal, U. Ghatak, S. K. Alam, 1981 .

Syntheses and stereochemistry of (±)-4α-methyl-10β-hydroxy-trans-1,2,3,4,5,6,7,10-octahydrophenanthrene-4β-carboxylic acid lactone and the four epimers of (±)-4-methyl-1,2,3,4,5,6,7,10-octahydro-phenanthrene-4-carboxylic acid.

N. R. Chatterjee, U. Ghatak, J. Chakravarty, 1967 .

A total synthesis of (±) - sempervirol acetate.

N. R. Chatterjee, U. Ghatak, 1967 .

Communications- Steroids and Related Natural Products. IV. Reduction of Lactones to Cyclic Ethers.

B. Green, G. Pettit, U. Ghatak, 1961 .

AN IMPROVED TOTAL SYNTHESIS OF (.+-.)-PODOCARPIC ACID BY A CYCLOALKYLATION ROUTE

Pranab R. Kanjilal, U. Ghatak, S. K. Alam, 1982 .

A facile synthetic route to complex polycyclic natural products through intramolecular alkylation with α-diazomethyl ketones

Subrata K. Ghosh, U. Ghatak, 1984 .

Acid-catalyzed intramolecular C-alkylation in .beta.,.gamma.-unsaturated diazomethyl ketones. 3. A simple synthetic route to hexahydro-4,9a-ethano-1H-fluoren-11-ones, hexahydro-6H-pentaleno[6a,1-a]indan-4-ones and hexahydrocyclobuta[j]fluoren-2(1H)-ones

U. Ghatak, G. Satyanarayana, S. Roy, 1982 .

Synthetic studies directed towards complex diterpenoids. Part 15. Synthesis and stereochemistry of the catalytic reduction of Δ4b(5)-gibbenes and related compounds

B. Ranu, M. Sarkar, U. Ghatak, 1982 .

A novel rearrangement of angularly fused cyclobutanone. Stereospecific syntheses of intermediates to the diterpene alkaloids and the C20 gibberellins

Subrata K. Ghosh, U. Ghatak, B. Sanyal, 1976 .

Synthetic studies towards complex diterpenoids. Part 13. Stereo-specific synthesis of intermediates to the diterpene alkaloids and the C20-gibberellins by a novel rearrangement of angularly fused cyclo-butanones

Subrata K. Ghosh, U. Ghatak, B. Sanyal, 1980 .

Condensed cyclic and bridged-ring systems. Part 6. Stereochemically defined synthesis of (±)-3-methoxy-17,18,19,20-tetranor-B-homophylloclada-1(10),2,4-triene-16-one through intramolecular alkylation of a γδ-unsaturated α′-diazomethyl ketone

J. Ray, U. Ghatak, 1977 .

Condensed cyclic and bridged-ring systems. Part IV. Stereochemically controlled synthesis of some endo-2-aryl-6-oxobicyclo[3.2.1]octanes and related compounds through intramolecular alkylations of γδ-unsaturated α′-diazomethyl ketones

B. Ranu, U. Ghatak, S. K. Alam, 1976 .

Condensed cyclic and bridged-ring systems. Part V. Application of the interamolecular oxo-carbenoid insertion reaction to the preparation of two new bridged-ring ketones

J. Ray, U. Ghatak, S. Chakrabarty, 1976 .

Synthetic studies towards complex diterpenoids. Part VIII. Stereo-controlled synthesis of (±)-2-methoxy-11β-methyl-4bαH-gibba-1(10a),2,4-trien-8-one and related compounds through intramolecular alkylations of γδ-unsaturated α′-diazomethyl ketones

U. Ghatak, S. Chakrabarty, Kalpana Rudra, 1974 .

Synthetic studies towards complex diterpenoids. Part 18. Total synthesis of (±)-isopisiferin and the related compounds

U. Ghatak, S. Deb, G. Bhattacharjee, 1990 .