Original Mitsunobu-Triggered Sequence Involved in a One-Pot Domino Process toward Tetracyclic Systems Bearing a Bis-<i>N</i>,<i>O</i>-acetal Junction
作者:Thomas Lepitre、Clement Denhez、Morgane Sanselme、Mohamed Othman、Ata Martin Lawson、Adam Daïch
DOI:10.1021/acs.joc.6b01523
日期:2016.10.7
Herein is reported an efficient, one-pot domino process through a 1,6-aza-Michael addition-triggered sequence and an original Mitsunobu-type concerted sequence for the synthesis of tetracyclic systems containing a bis-N,O-acetal junction. This methodology led to the construction of four new bonds, the cleavage of three C–O bonds, and the generation of an asymmetric center. Mitsunobu activation afforded
本文报道了通过1,6-氮杂-迈克尔加成触发的序列和原始的Mitsunobu-类型一致的序列的有效的一锅多米诺过程,用于合成含有双-N,O-乙缩醛连接的四环系统。这种方法学导致了四个新键的构建,三个C–O键的断裂以及一个不对称中心的生成。Mitsunobu激活提供了最终的环闭合,涉及两个键的产生,这在报道的Mitsunobu类型序列中仍然是空前的。后者在具有挑战性的C 6下以区域选择性方式发生-吡啶酮中间体的-位置。在充分取代的对映体纯氨基醇的情况下,非对映异构体过量最多达到95:5。计算研究允许区分Mitsunobu序列的有利途径,并支持此步骤中观察到的区域选择性和非对映选择性。