Expeditious synthesis of multisubstituted indoles <i>via</i> multiple hydrogen transfers
作者:Taira Yoshida、Keiji Mori
DOI:10.1039/c8cc07009a
日期:——
types of hydrogen transfer processes ([1,5]-hydride shift, proton transfer, and [1,2]-hydride shift) occurred to give various 3-alkoxycarbonylindoles. Further study revealed that a [1,2]-alkyl shift instead of a [1,2]-hydride shift proceeded to afford 3-alkylindoles from the substrates with an amino group having tertiary carbons adjacent to a nitrogen atom.
本文描述了经由多个氢转移的快速构造的多取代的吲哚骨架。当在1.0当量的脱水剂存在下用催化量的TiCl 4处理邻氨基酮酸酯时,三种类型的氢转移过程([1,5]-氢化物转移,质子转移和[1,2]-发生氢化物转移,得到各种3-烷氧基羰基吲哚。进一步的研究表明,由[1,2]-烷基取代而不是[1,2]-氢化取代,从底物中得到3-烷基吲哚,其具有具有与氮原子相邻的叔碳的氨基。