Indazoles: Regioselective Protection and Subsequent Amine Coupling Reactions
作者:David J. Slade、Nicholas F. Pelz、Wanda Bodnar、John W. Lampe、Paul S. Watson
DOI:10.1021/jo9006656
日期:2009.8.21
Indazoles are unselectively protected under strongly basic conditions to give a mixture at N-1 and N-2. Under mildly acidic conditions, regioselective protection at N-2 takes place. Thermodynamic conditions lead to regioselective protection at N-1. This trend applies to various substituted indazoles. Protected 5-bromoindazoles participate in Buchwald reactions with a range of amines to generate novel derivative.
Multidirectional Synthesis of Substituted Indazoles via Iridium-Catalyzed C–H Borylation
作者:Scott A. Sadler、Andrew C. Hones、Bryan Roberts、David Blakemore、Todd B. Marder、Patrick G. Steel
DOI:10.1021/acs.joc.5b00452
日期:2015.5.15
In the absence of a steric directing group, iridium-catalyzed. C-H borylation of N-protected indazoles occurs rapidly and selectively at C-3 and the resulting boronate esters can be utilized in a range of downstream conversions. The functional group tolerance of the iridium-catalyzed C-H borylation reaction enables simple and efficient multidirectional syntheses of substituted indazoles to be realized.