A Chiron Approach to Diversity-Oriented Synthesis of Aminocyclitols, (-)-Conduramine F-4 and Polyhydroxyaminoazepanes from a Common Precursor.

The total syntheses of aminocyclitols, (-)-conduramine F-4, and polyhydroxyaminoazepanes have been achieved from a common precursor derived from tri-O-benzyl-d-glucal through a 'diversity-oriented' approach. Tri-O-benzyl-d-glucal was converted into a protected 1,6-diol through a sequence of steps that include transformation to a 2-tosylamidoglucose derivative, selective deprotection of primary C-6 benzyloxy group, LiAlH4-mediated one-step reduction of acetate groups, and reductive ring opening of the resulting hemiacetal as the key steps. The 1,6-diol served as a common precursor in our diversity oriented approach toward the target molecules. Mesylation of the diol followed by double nucleophilic substitution reaction with primary amines led to the synthesis of amino-substituted polyhydroxyazepanes. On the other hand, dialdehyde obtained from the oxidation of 1,6-diol was found to be a convenient starting material for the synthesis of aminocyclitols and (-)-conduramine F-4. McMurry coupling of the dialdehyde was successfully employed, for the first time, to construct the carbocyclic framework of aminoyclitols, while bis-Wittig olefination of the dialdehyde followed by Grubb's(II)-catalyzed RCM delivered (-)-conduramine F-4. The stereochemistry of newly created chiral centers in aminocyclitols was established through single crystal X-ray crystallography and detailed NOE studies.

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