Studies in alkylation of 3-methyl-3-sulfolene and thermolysis of resulting 2-alkyl-3-sulfolenes: Convenient synthesis of 1,2-disubstituted-1,3-dienes
作者:Shailesh R Desai、Vinayak K Gore、T Mayelvaganan、R Padmakumar、Sujata V Bhat
DOI:10.1016/s0040-4020(01)89010-4
日期:——
Various 1,2-disubstituted-1,3-dienes have been synthesised through the alkylation of 3-methyl-3-sulfolene (1) followed by thermolysis of the resulting 2-alkyl-3-methyl- 3-sulfolene (3,7). The alkylations with bulky iodides, particularly, containing ethylene ketal or phenyl sulfide moiety yield considerable amounts of rearranged 2-alkyl-3-methyl-2-sulfolene (4). The sulfolenes 3,4 & 7 have been desulfonylated
Convenient synthesis of decalin systems of bioactive terpenoids
作者:Vinayak K Gore、Shailesh R Desai、T Mayelvaganan、R Padmakumar、Shreeshailkumar B Hadimani、Sujata V Bhat
DOI:10.1016/s0040-4020(01)86353-5
日期:1993.3
New analogues of bioactive terpenoids, forskolin, nimbolide, isozonarol and ambrox have been synthesized using general Diels-Alder reaction of 2-formyl-4,4-dimethyl-cyclohexa-2,5-dienone (7) with 1,2-disubstituted-1,3-dienes (8a–k) which yielded endo- & exo-adducts. The deformylation, epimerisation, angular methylation, reduction and oxidation studies on these adducts have been reported.