Asymmetric reduction of ethynyl ketones and ethynylketoesters by secondary alcohol dehydrogenase from Thermoanaerobacter ethanolicus †
作者:Christian Heiss、Robert S. Phillips
DOI:10.1039/b001329n
日期:——
Secondary alcohol dehydrogenase (SADH) from Thermoanaerobacter ethanolicus, an NADP-dependent, thermostable oxidoreductase, reduces ethynyl ketones and ethynylketoesters enantioselectively to the corresponding propargyl (propargyl = prop-2-ynyl) alcohols. Ethynyl ketones, in general, are reduced with moderate enantioselectivity (with the exception of 4-methylpent-1-yn-3-one, which gives the (S)-alcohol
仲醇脱氢酶(SADH)从嗜热ethanolicus,一个北美发展计划依赖性的热稳定氧化还原酶将乙炔基酮和乙炔基酮酸酯对映选择性地还原为相应的炔丙基(炔丙基=炔-2-炔基) 酒类。乙炔基酮类通常以中等对映选择性降低(除 4-甲基戊-1-yn-3-一,得到(S)醇的ee> 98%)。虽然乙炔基酮类带有少量(最多正丙基)烷基取代基还原为(S)醇,较大的乙炔基酮类给出(R)-醇。相反,乙炔基酮酸酯被转化为具有优异光学纯度的(R)-乙炔基羟基酯。出乎意料的是,与乙炔基羟基酯相比,异丙基乙炔基酮酯具有更高的化学收率和更高的对映选择性。甲基或乙基乙炔基酮酸酯。光学纯的乙炔基羟基酯可用作不对称合成的有用的手性结构单元。