Organocatalytic
<i>Trans</i>
Semireduction of Primary and Secondary Propiolamides: Substrate Scope and Mechanistic Studies
作者:R. Justin Grams、Monsurat M. Lawal、Connor Szwetkowski、Daniel Foster、Carol Ann Rosenblum、Carla Slebodnick、Valerie Vaissier Welborn、Webster L. Santos
DOI:10.1002/adsc.202101020
日期:2022.1.4
We report a chemoselective, phosphine-catalyzed semireduction of primary and secondary propiolamides. In the presence of stoichiometric pinacolborane and catalytic n-tributylphosphine, a variety of propiolamides were successfully converted to the corresponding acrylamides in excellent yield with (E)-stereoselectivity. The reaction condition is tolerant of various functional groups including alkene
我们报告了初级和次级丙酰胺的化学选择性、膦催化的半还原反应。在化学计量的频哪醇硼烷和催化正三丁基膦的存在下,各种丙酰胺以优异的收率成功转化为相应的丙烯酰胺,具有(E)-立体选择性。反应条件可以容忍各种官能团,包括烯烃、炔烃、酮或酯。氘标记研究表明,来自活化频哪醇硼烷的氢化物被添加到 α-碳,酰胺氮上的质子被 β-碳提取以提供 ( E )-丙烯酰胺。DFT 计算揭示了 ( E )- 在 ( Z)-异构体。