Process for preparing taxol side chain using heterogeneous trifunctional catalyst
申请人:Council of Scientific and Industrial Research
公开号:US06706901B1
公开(公告)日:2004-03-16
The present invention relates to an improved process for the preparation of taxol side chain by synthesizing (2R,3S)-2,3-dihydroxy-3-phenylpropionate with greater than 99% enantioselectivity and devoid of osmium even in crude form in a single pot using a recyclable multifunctional catalysts, conversion of diol obtained without further crystallization into bromoacetate, reaction of bromoacetate with NaN3 in organic solvent followed by deacetylation with to obtain azido alcohol, benzoylation followed by hydrogenation of azido alcohol to obtain the (2R,3S)-(N-)-benzoyl-3-phenylisoserine methyl ester in 67% yield.
本发明涉及一种通过在单一容器中使用可回收的多功能催化剂,在合成(2R,3S)-2,3-二羟基-3-苯基丙酸酯时,具有超过99%的对映选择性,并且即使在粗制形式下也不含有钌的改进过程。将获得的二醇转化为溴乙酸酯,然后在有机溶剂中将溴乙酸酯与NaN3反应,随后脱乙酰基化以获得偶氮醇,对偶氮醇进行苯甲酰化,然后氢化以获得(2R,3S)-(N-)-苯甲酰-3-苯基异丝氨酸甲酯,产率为67%。