Synthesis of Benzyltributylstannanes by the Reaction of N-Tosylhydrazones with Bu3SnH
摘要:
An efficient stannylation process with Ntosylhydrazones or directly with carbonyl compounds has been developed. A series of functionalized benzyl-and alkyltributylstannanes can be synthesized in moderate to good yields under transition-metal-free conditions. Tandem transformations involving stannylation/Stille cross-coupling reaction have been carried out without purification of the benzyltributylstannane intermediates to afford a series of diarylmethane derivatives.
Nonpeptide endothelin antagonists: from lower affinity pyrazol-5-ols to higher affinity pyrazole-5-carboxylic acids
作者:Jidong Zhang、Stanislas Didierlaurent、Michel Fortin、Dominique Lefrançois、Eric Uridat、Jean Paul Vevert
DOI:10.1016/s0960-894x(00)00232-8
日期:2000.6
Random screening of compounds in endothelin receptor (ETA and ETB) binding assays led to the discovery of a new class of pyrazol-5-ol ligands. Characterization of structural features crucial for binding activities of these pyrazol-5-ols, by structure-activity-relationship (SAR) studies, allowed us to design a novel class of pyrazole-5-carboxylic acids as more potent ET antagonists. (C) 2000 Elsevier Science Ltd. All rights reserved.