Gold‐Catalyzed Iminations of Terminal Propargyl Alcohols with Anthranils with Atypical Chemoselectivity for C(1)‐Additions and 1,2‐Carbon Migration
作者:Manisha Skaria、Sayaji Arjun More、Tung‐Chun Kuo、Mu‐Jeng Cheng、Rai‐Shung Liu
DOI:10.1002/chem.201905283
日期:2020.3.18
This work reports gold‐catalyzed iminations of terminal propargyl alcohols with anthranils or isoxazoles to yield E‐configured α‐amino‐2‐en‐1‐ones and ‐1‐als with complete chemoselectivity. These catalytic iminations occur exclusively with C(1)‐nucleophilic additions on terminal alkynes, in contrast to a typical C(2)‐route. For 3,3‐dialkylprop‐1‐yn‐3‐ols, a methyl substituent is superior to long alkyl
这项工作报道了末端炔丙基醇与蒽或异恶唑的金催化的胺化反应,可产生具有完全化学选择性的E构型的α-氨基-2-en-1和1 al。与典型的C(2)路线相反,这些催化亚胺仅在末端炔烃上与C(1)亲核加成一起发生。对于3,3-二烷基丙-1-炔-3-醇,甲基取代基优于长烷基链,这是1,2-向α-亚氨基金卡宾的迁移基团。对于仲丙-1-炔-3-醇,苯基,乙烯基和环丙基取代基作为迁移基团优于氢,从而避免了典型的金卡宾反应。进行了DFT计算以合理化所观察到的C(1)-区域选择性和基于金卡宾途径的优选环丙基迁移。