作者:Gary M. Noonan、David Newton、Christopher J. Cobley、Andrés Suárez、Antonio Pizzano、Matthew L. Clarke
DOI:10.1002/adsc.200900871
日期:——
possible, provided steps are taken to minimise racemisation of the aldehyde products, and this work demonstrates the effect of various conditions and variables on racemisation. Using the Landis diazaphospholane ligands up to 68% ee can be realised under very mild conditions. Other dialkylacrylamides were also hydroformylated under mild conditions giving similar or better enantioselectivities, including
二甲基丙烯酰胺可以以很高的化学和区域选择性加氢甲酰化。该底物的不对称加氢甲酰化是可能的,只要采取步骤使醛产物的外消旋化最小化即可,并且这项工作证明了各种条件和变量对外消旋化的影响。在非常温和的条件下,使用Landis二氮磷杂环戊烷配体可以达到ee的68%。其他二烷基丙烯酰胺也可在温和条件下加氢甲酰化,得到相似或更好的对映选择性,包括丙烯酸的Weinreb酰胺(71%ee),以及二乙基丙烯酰胺的不对称加氢甲酰化生成手性醛,ee最高可达82%。