The synthesis of αβ-unsaturated ketones from β-silylenones and β-silylynones
作者:Ian Fleming、David A. Perry
DOI:10.1016/s0040-4020(01)93277-6
日期:——
Conjugate addition, followed by alkylation, bromination and desilyl-bromination make the β-silylketone (4) an a3d3-synthon (5) and the β-silylynone (6) a 2a3d3-synthon (7).
共轭加成,然后进行烷基化,溴化和去甲硅烷基溴化反应,使β-甲硅烷基酮(4)成为3 d 3-合成子(5)和β-甲硅烷基酮(6)成为2a 3 d 3-合成子(7)。
Reactivity of the 1-t.butylthio-3-methoxy-1-alkenes towards metalating agents, II. Allylic deprotonation of the E-isomers and of the Z-propenyl derivative.
作者:O. Ruel、C.Bibang Bi Ekogha、S.A. Julia
DOI:10.1016/s0040-4039(00)94018-8
日期:1983.1
Deprotonation of the title compounds with a lithiating agent and subsequent alkylation furnish the 1-substituted products . The 1-t.butylthio-3-methoxy-1-lithio-1-alkenes become newequivalents of the hypothetical anions I.
no hydroacylations exist that make use of aldehydes without a chelating group, especially when combined with terminal alkynes. Here we report a synergistic nickel–photocatalytic system that allows for the highly regio- and stereoselective hydroacylation of unactivated aldehydes and alkynes in milder conditions without the use of chelating groups.