Chemoenzymatic Preparation of Optically Active<i>trans</i>-Cyclohexane-1,2-diamine Derivatives: An Efficient Synthesis of the Analgesic U-(−)-50,488
作者:Javier González-Sabín、Vicente Gotor、Francisca Rebolledo
DOI:10.1002/chem.200400607
日期:2004.11.19
Stereoespecific syntheses of (+/-)-trans-N,N-cyclohexane-1,2-diamines ((+/-)-4 a-g) were carried out from the corresponding (+/-)-trans-N,N-dialkylaminocyclohexanols by successive treatment with mesyl chloride and aqueous ammonia. The stereochemical outcome indicates the formation of a meso-aziridinium ion intermediate. Kinetic resolutions of diamines (+/-)-4 were efficiently accomplished in aminolysis
(+/-)-反-N,N-环己烷-1,2-二胺((+/-)-4 ag)的立体定向合成是从相应的(+/-)-反-N,N-通过连续用甲磺酰氯和氨水处理二烷基氨基环己醇。立体化学结果表明形成了中叠氮鎓离子中间体。二胺(+/-)-4的动力学拆分可有效地完成南极假丝酵母脂肪酶B催化的氨解反应,其中乙酸乙酯为溶剂和酰基供体。分离出的乙酰胺和其余的二胺作为苄氧羰基衍生物,具有很高的ee值(92-99%)。一种氨基甲酸酯用作镇痛剂U-(-)-50,488的前体。