Umpolung Reactivity of Ynamides: An Unconventional [1,3]‐Sulfonyl and [1,5]‐Sulfinyl Migration Cascade
作者:B. Prabagar、Rajendra K. Mallick、Rangu Prasad、Vincent Gandon、Akhila K. Sahoo
DOI:10.1002/anie.201813143
日期:2019.2.18
developed in the presence of XPhosgold catalyst. This reaction is the first example of a general [1,3]‐sulfonyl migration from the nitrogen center to the β‐carbon atom of ynamides, followed by umpolung 5‐endo‐dig cyclization of the ynamide α‐carbon atom to the gold‐activated alkyne, and final deaurative [1,5]‐sulfinylation. This process allows the synthesis of peripherally decorated unconventional 4‐sulfinylated
在XPhosgold催化剂的存在下,开发了炔烃系链的酰胺的区域选择性磺酰基/亚磺酰基迁移环异构化级联反应。该反应是一般的[1,3]-磺酰基从氮中心迁移到乙酰胺的β-碳原子的第一个例子,随后是将甲酰胺α-碳原子的5-内酰胺环缩合到金-的环戊酰胺的第一个例子。活化的炔烃,并最终脱氧[1,5]-亚磺酰化。这个过程可以从N-炔丙基-链状的酰胺中合成范围很广的非传统的4-亚磺酰化吡咯。相比之下,N-高炔丙基拴系的酰胺发生分子内四氢脱氢Diels-Alder反应,生成2,3-二氢-苯并[ f]吲哚衍生物。通过控制实验和密度泛函理论研究来研究反应途径。