Synthetic reactions by complex catalysts. XV. Copper(I)-alkyl isocyanide catalyzed dimerization of .alpha.,.beta.-unsaturated carbonyl and nitrile compounds
Phosphine-catalyzed dimerization of activated alkenes under ambient and high pressure conditions
作者:Gérard Jenner
DOI:10.1016/s0040-4039(00)00346-4
日期:2000.4
Acrylic compounds dimerizeunder Morita–Baylis–Hillman conditions in the presence of soluble phosphines. Dimerization of β-substituted analogs may require highpressures. The process is selective and high yielding and affords densely functionalized products.
The N-heterocycliccarbene (NHC)-catalyzed dimerizations of a variety of disubstituted Michael acceptors have been investigated. In addition to the tail-to-tail dimerization of methacrylates reported previously, the scope of vinylidene substrates expands to γ-methyl-α-methylene-γ-butyrolactone, dimethyl 2-methylenepentanedioate, dimethyl itaconate, methacrylamides, and 2-isopropenylbenzoxazole, none
A novel cyclodimerization of 3-methyl-3-butenenitrile. An efficient synthesis of 4-cyanoisophorone
作者:Kunihiko Takabe、Suguru Ohkawa、Toshio Sato、Gia Hien Tang、Takao Katagiri
DOI:10.1016/0040-4039(80)80206-1
日期:1980.1
Dimerization of 3-methyl-3-butenenitrile (1) by lithium dialkylamide gave selectively 3,5,5-trimethyl-1-amino-4-cyanocyclohexa-1,3-diene (2), which was easily hydrolyzed by aqueous acid to afford 4-cyanoisophorone (3,5,5-trimethyl-4-cyano-cyclohex-2-enone) (3) quantitatively.