Selective anti-tubercular purines: Synthesis and chemotherapeutic properties of 6-aryl- and 6-heteroaryl-9-benzylpurines
作者:Morten Brændvang、Lise-Lotte Gundersen
DOI:10.1016/j.bmc.2005.06.054
日期:2005.12
6-Aryl- and 6-heteroaryl-9-benzylpurines have been synthesized employing palladium-catalyzed coupling reactions in the step forming the C-C or C-N bond between the aryl- or heteroaryl and the purine. The compounds were screened for activity against Mycobacterium tuberculosis as well as representative Gram+ and Gram- bacteria, and for cytotoxic effects on mammalian cells. Several potent antimycobacterials were identified. These compounds probably act by a novel and selective mechanism; they exhibit low toxicity toward other bacteria as well as mammalian cells. (c) 2005 Elsevier Ltd. All rights reserved.
Highly Regioselective Three-Component Domino Heck–Negishi Coupling Reaction for the Functionalization of Purines at C6
A highly regioselective three-component domino Heck-Negishi coupling reaction has been developed. Organozinc reagents are used to trap an alkylpalladium intermediate of olefins for a first example in the domino Heck reaction. This reaction is applicable to acrylates (or acrylamides) and purine compounds, producing a series of novel purine compounds with carbon substituents at the C6 position in moderate to good yields.