Hydride transfer versus electron transfer in the reduction of 4-phenyl-3-halo-3-buten-2-ones mediated by Pichia stipitis
作者:Dávila S. Zampieri、Luiz A. Zampieri、J. Augusto R. Rodrigues、Bruno R.S. de Paula、Paulo J.S. Moran
DOI:10.1016/j.molcatb.2011.07.001
日期:2011.11
Reductions of (Z)-C6H5CHCXC(O)CH3 (X = Cl, Br) mediated by Pichia stipitis gave 4-phenylbutan-2-one through dehalogenation of intermediaries 3-halo-4-phenylbutan-2-one by an electron transfer mechanism. The addition of 1,3-dinitrobenzene avoids the dehalogenation and thus the corresponding (2S,3S)-halohydrins were obtained in excellent enantiomeric excesses by a hydride transfer mechanism. Irganox® 1010 and
毕赤酵母介导的(Z)-C 6 H 5 CHCXC(O)CH 3(X = Cl,Br)的还原通过中间体3-卤代-4-苯基丁烷-2-酮的脱卤作用而得到4-苯基丁酮-2-酮。通过电子转移机制。1,3-二硝基苯的加入避免了脱卤作用,因此通过氢化物转移机理以极好的对映体过量获得了相应的(2 S,3 S)-卤代醇。IRGANOX ® 1010和1076也被用来抑制电子传递机制。所获得的卤代醇是获得旋光性环氧化物和氨基醇的重要手性结构单元。