A facile synthesis of (−)- and (+)-Geissman–Waiss lactone via intramolecular Rh(II)-carbenoid mediated C–H insertion reaction: synthesis of (1R,7R,8R)-turneforcidine
作者:Andrew G.H Wee
DOI:10.1016/s0040-4039(00)01664-6
日期:2000.11
intramolecular C–H insertion reaction in chiral non-racemic diazoacetates (−)-6 and (+)-8 catalyzed by chiral Rh2(MPPIM)4 proceeded efficiently, with excellent regioselectivity and cis-diastereoselectivity, to give (−)- and (+)-Geissman–Waiss lactone, 4b, respectively. Bicyclic lactone (−)-4b was used in the synthesis of the necine base (−)-turneforcidine 3.
手性Rh 2(MPPIM)4催化的手性非外消旋重氮乙酸酯(-)- 6和(+)- 8的分子内C–H插入反应高效进行,具有出色的区域选择性和顺式-非对映选择性,得到(-)和(+)-Geissman-Waiss内酯,分别为4b。双环内酯(-)- 4b用于合成烟碱(-)-turneforcidine 3。