Nucleophilic Cyclopropanation Reaction with Bis(iodozincio)methane by 1,4-Addition to α,β-Unsaturated Carbonyl Compounds
作者:Kenichi Nomura、Takaharu Hirayama、Seijiro Matsubara
DOI:10.1002/asia.200900123
日期:2009.8.3
Treatment of α,β‐unsaturated ketones with an electrophilic site at the γ‐position in the presence of trimethylsilyl cyanide with bis(iodozincio)methane afforded the (Z)‐silyl enol ether of the β‐cyclopropyl substituted ketone in good yields. The reaction proceeds by 1,4‐addition to form an enolate, and its sequential intramolecular nucleophilic attack to an adjacent electrophilic site. The reaction
在存在三甲基甲硅烷基氰化物和双(碘嗪)甲烷的情况下,通过在γ位上的亲电位点处理具有亲电性的α,β-不饱和酮,可以很好地获得β-环丙基取代的酮的(Z)-甲硅烷基烯醇醚。该反应通过1,4加成反应形成烯醇化物,其分子内亲核分子依次进攻相邻的亲电子位点。γ-乙氧基羰基-α,β-不饱和酮与双(碘嗪)甲烷在三甲基甲硅烷基氰化物的存在下反应,可得到1-乙氧基-1-三甲基甲硅烷氧基环丙烷衍生物。另外,获得的均烯酸酯等同物与亚胺的反应非对映选择性地产生1-(E)-烯基-2-(1-氨基烷基)烷醇。