Concerning hydride reduction of Diels-Alder products of Danishefsky's diene

Addition Diels Alder du t-butyldimethylsiloxy (TBDMSO)-3 methoxy-1 butadiene-1,3 et de la dihydro-3,6 methyl-2 methoxy-6 pyrannone-2: obtention de TBDMSO-7 dimethoxy-1,5 methyl-2 tetrahydro-4a,5,8,8a isochromannone-4 dont on etudie la reduction par LiAlH 4 en perhydro ou tetrahydro-4a,7,8,8a isochromannediol-4,7 ou perhydro hydroxy-4 isochromannone-7