Addition reactions of the trichlorocyclopropenylium ion with alkenes: A novel access to cyclopropene and cyclopropenone derivatives
作者:Klaus Musigmann、Herbert Mayr、Armin de Meijere
DOI:10.1016/s0040-4039(00)96552-3
日期:1987.1
Trichlorocyclopropenylium tetrachloroaluminate 1+-AlCl−4 reacts with alkenes in nitromethane at −35°C to give the 1:1 addition products 2+-AlCl−4, which can be converted into the 2-chlorocyclopropenones 5 or the ä,β-acetylenic carboxylates 6.
MUSIGMANN, KLAUS;MAYR, HERBERT;MEIJERE, ARMIN DE, TETRAHEDRON LETT., 31,(1990) N, C. 1261-1264
作者:MUSIGMANN, KLAUS、MAYR, HERBERT、MEIJERE, ARMIN DE
DOI:——
日期:——
Regio- and stereoselective ring-opening reactions of cyclopropenones: α-methylene-γ-butyrolactones via additions of trichlorocyclopropenylium ions to alkenes
作者:Klaus Musigmann、Herbert Mayr、Armin de Meijere
DOI:10.1016/s0040-4039(00)88780-8
日期:1990.1
The 2-chloro-3-(2′-chloroalkyl)cyclopropenones 4, readily obtained by hydrolysis of the adducts of the trichlorocyclopropenylium ion onto alkenes, thermally rearrange to propiolic acid chlorides 6. Treatment of 4 with TosOH·H2O in CH2Cl2 yields the (E)-3-chloro-2-(2′-chloroalkyl)acrylic acids 9, which have been converted in two simple steps to α-methylene-γ-butyrolactones 11 with good overall yields