Diels-alder reactions of pyrano[3,4-b]indol-3-ones with substituted alkenes : synthesis of 1,2-dihydrocarbazoles - part II
作者:P. Van Doren、F. Compernolle、G. Hoornaert
DOI:10.1016/s0040-4020(01)90537-x
日期:1990.1
The Diels-Alder reaction of pyrano[3,4-b]indol-3-ones 1 with trisubstituted dienophiles 2 yields stable 1,2-dihydrocarbazoles 4. Electronic and steric factors, together with a gradual change in mechanism from a concerted to a more stepwise reaction, are invoked to explain the regiochemical distribution of products.
A Convenient Synthesis of 3-Substituted-5, 5-dimethyl-tetrahydro-2-benzopyran-8-ones Through Hetero-Diels-Alder Reaction
作者:Shailesh R. Desai、Vinayak K. Gore、Sujata V. Bhat
DOI:10.1080/00397919208021081
日期:1992.1
Abstract 2-Formyl-4,4-dimethylcyclohexa-2,5-dien-1- one undergoes hetero-Diels-Alder reactions with electron-rich olefins to yield 3-substituted-5,5-dimethyl-3,4,4a,5-tetrahydro-8H-2-benzopyrane-8-ones. The endo addition is favoured.
Convenient synthesis of (1H)-isoindoles and cyclopenta[c]pyrrole skeletons
作者:P.Veera Reddy、Sujata V Bhat
DOI:10.1016/s0040-4039(97)10429-4
日期:1997.12
Diels-Alder reactions of various α, β-unsaturated cycloalkenones with 4-methyl-5-ethoxy-oxazole in the presence of ZnBr2 provide hydro-(1H)-isoindoles and hydrocyclopenta[c]pyrrole.
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.