Stereoselective Synthesis of (<i>Z</i>)-α,β-Unsaturated Ketones via Hydromagnesiation of Alkynylsilanes
作者:Hong Zhao、Ming-Zhong Cai
DOI:10.1081/scc-120018925
日期:2003.1.6
Abstract Hydromagnesiation of alkynylsilanes 1 gives (Z)-α-silylvinyl Grignard reagents 2, which are treated with alkyl iodides in the presence of CuI to give (Z)-1,2-disubstituted vinylsilanes 3 in high yields. Intermediates 3 can undergo the Friedel–Crafts acylation reactions with acyl chlorides to afford (Z)-α,β-unsaturated ketones in good yields with high stereoselectivity.
摘要 炔基硅烷 1 的加氢氧化得到 (Z)-α-甲硅烷基乙烯基格氏试剂 2,在 CuI 存在下用烷基碘处理以高产率得到 (Z)-1,2- 二取代乙烯基硅烷 3。中间体 3 可以与酰氯进行 Friedel-Crafts 酰化反应,以良好的收率和高立体选择性提供 (Z)-α,β-不饱和酮。