Domino Carbocationic Cyclization of Functionalized Cyclopropyl Ketones: Facile One-Pot Access to Peri- and Angularly Fused Polycyclic Aromatic and Heteroaromatic Frameworks
作者:Sukumar Nandi、U. K. Syam Kumar、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1021/jo020230r
日期:2002.7.1
yields in a one-pot operation. The methodology provides efficient, high-yield routes for synthesis of novel substituted dihydrophenalenes, dihydrobenzo[d,e]anthracene, cyclopenta[a]naphthalene, and fused heteroaromatics such as substituted 4,5-dihydrobenzo[c,d]indole, dihydronaphtho[1,8-b,c]thiophene, dihydroindeno[5,4-b]- and -[4,5-b]-thiophenes, cyclopenta[a]carbazole, and dihydrocyclopenta[e]indazol-3-one
Acid catalyzed ring opening of α-bis(methylthio)methylenealkyl cyclopropyl ketones: An intramolecular alkylation approach to substituted cyclopentanones
作者:B Deb、C.V Asokan、H Ila、H Junjappa
DOI:10.1016/s0040-4039(00)87848-x
日期:——
α-Bis(methylthio)methylenealkyl cyclopropylketones , prepared by the addition of dimethyloxosulphonium methylide to the respective α-cinnamoylketene dithioacetals , undergo facile acid catalyzed intramolecular cyclization with participation of bis(methylthio)methylene double bond to give substituted cyclopentanones - and - in good yields.