Enantiocontrolled Synthesis of 2,3,6-Trisubstituted Piperidines Using (η<sup>3</sup>-Dihydropyridinyl)molybdenum Complexes as Chiral Scaffolds. Total Synthesis of (−)-Indolizidine 209B
作者:Chutian Shu、Ana Alcudia、Jingjun Yin、Lanny S. Liebeskind
DOI:10.1021/ja011635g
日期:2001.12.19
Enantiopure TpMo(CO)2(pyridinyl) complexes were prepared using an efficient and scalable enzymatic kinetic resolution of the precursor to the molybdenum complex. A single TpMo(CO)2(pyridinyl) complex can function as a chiralscaffold for the enantiocontrolled synthesis of either 2,3,6-cis- or 2,6-cis-3-trans-trisubstituted piperidines. The synthetic potential of this methodology was demonstrated by
readily react with ethereal H2O2 in the presence of catalytic amounts of Na2MoO4-gly or MoO2(acac)2, affording the C═C trans hydroxylation–hydroperoxylation products in good yields with high regio- and stereoselectivity. Use of enantiomers of cyclic substrates resulted in corresponding enantiopure diol-tert-hydroperoxides. The possibility of further conversion of the diol-tert-hydroperoxides into triols
在催化量的Na 2 MoO 4 -gly或MoO 2(acac)2的存在下,一系列烯丙醇易于与醚H 2 O 2反应,从而以高收率提供C═C反羟基化-氢过氧化产物具有高区域选择性和立体选择性。使用环状底物的对映异构体产生相应的对映体纯的二醇-叔氢过氧化物。还举例说明了将二醇-叔氢过氧化物进一步转化为具有包含季中心的分离的叔-过氧基团的三醇或线性结构单元的可能性。