Stereoselective reductive radical cyclization of ketonitriles catalyzed by Cp2TiCl2 in the presence of chlorosilane and zinc
作者:Longhu Zhou、Toshikazu Hirao
DOI:10.1016/s0040-4020(01)00645-7
日期:2001.8
Reductive radical cyclization of ketonitriles was catalyzed by Cp2TiCl2 in the presence of Me3SiCl, zinc powder and imidazole, giving the 2-amino-3-cyano-2-cyclopenten-1-ols in moderate to good yields with high trans selectivity (up to 94% trans). The influence of the catalyst, chlorosilane, co-reductant, solvent, and temperature on both the yield and diastereoselectivity of the cyclized products was
酮腈的还原性自由基环化物通过的Cp催化2的TiCl 2在我的存在3的SiCl,锌粉和咪唑,在温和给予2-氨基-3-氰基-2-环戊烯-1-醇,以良好的产率具有高反式选择性(最高94%反式)。详细研究了催化剂,氯硅烷,助还原剂,溶剂和温度对环化产物收率和非对映选择性的影响。