dl-selective reductive coupling/Dieckmann condensation sequence of α,β-unsaturated amides with samarium(II) iodide/HMPA. Synthesis of a new ligand, trans-1,2-cyclopentanediyl-2,2′-biphenol
作者:Shuji Kanemasa、Hidetoshi Yamamoto、Shigeru Kobayashi
DOI:10.1016/0040-4039(96)01951-x
日期:1996.11
SmI2-HMPA in THF, the N,N-dimethyl derivatives of (E)-α,β-unsaturated amides produce the 1,2-trans-2,3-trans stereoisomers of 2,3-disubstituted 5-oxo-1-cyclopentane-carboxamides via a highly dl-selective reductive coupling followed by Dieckmann condensation. Water-d2 is an effective quenching agent. This reaction is successfully applied to the synthesis of trans-1,2-cyclopentanediyl-2,2′-biphenol, which
通过SmI 2 -HMPA在THF中的作用,(E)-α,β-不饱和酰胺的N,N-二甲基衍生物生成2,3-二取代的5- ,1,2-反式-2,3-反式立体异构体羰基-1-环戊烷-羧酰胺通过高度d1-选择性还原偶联,然后进行Dieckmann缩合反应。Water- d 2是有效的淬灭剂。该反应成功地用于合成反式-1,2-环戊二基-2,2'-联苯酚,这是一种新型的C 2对称手性配体。