Preparation of Alkyl Carbamate of 1‐Protected Indole‐3‐methylamine as a Precursor of Indole‐3‐methylamine
作者:Hao Song、Wei Chen、Yin Wang,、Yong Qin
DOI:10.1080/00397910500287967
日期:2005.11.1
Abstract A series of alkyl carbamates 3 of 1‐protected indole‐3‐methylamines, alkyl carbamates 6 of thiophenylmethylamines, and pyrrolylmethylamines were prepared from the corresponding acetamides 2 and 5 in good to excellent yields via diacetoxyiodobenzene‐promoted Hofmann rearrangement. For a successful Hofmann rearrangement, an electron‐withdrawing group on position 1 of indolylacetamide and pyrrolylacetamide
The directcatalyticsynthesis of carbamates from CO2, amines and methanol was achieved by controlling both the reaction equilibrium and the reactivity of the three components. The combination of CeO2 and 2‐cyanopyridine was an effective catalyst, providing various carbamates including N‐arylcarbamates in high selectivities.