Process for the synthesis of an endothelin receptor antagonist
申请人:——
公开号:US20020107391A1
公开(公告)日:2002-08-08
The present invention relates to a practical and efficient way to synthesize the compound for the endothelin receptor antagonist involving a Grignard addition and a cyclization reaction to give a desired compound of the general formula shown below:
1
During investigating water-compatible Lewis acids catalyzed etherifications using alcohols as alkylating reagents directly, we developed Fe(III)-catalyzed trityl benzyl ether formations irradiated by microwave. Then an in situ trityl benzyl ether formation and disproportionation cascade reaction was achieved to yield the benzaldehyde products with good functional group tolerances under neat conditions
Practical Asymmetric Synthesis of a Selective Endothelin A Receptor (ETA) Antagonist
作者:Zhiguo J. Song、Matthew Zhao、Lisa Frey、Jing Li、Lushi Tan、Cheng Y. Chen、David M. Tschaen、Richard Tillyer、Edward J. J. Grabowski、Ralph Volante、Paul J. Reider、Yoshiaki Kato、Shigemitsu Okada、Takayuki Nemoto、Hiroki Sato、Atsushi Akao、Toshiaki Mase
DOI:10.1021/ol016601s
日期:2001.10.1
[structure: see text]. A practical, chromotography-free asymmetric synthesis was developed for the large scale preparation of an endothelinreceptorantagonist 2. This synthesis includes a new efficient process for the preparation of 6-bromo-2,3-dihydrobenzofuran, a stereoselective conjugate addition of an aryllithium followed by stereospecific addition of the Grignard reagent of the top aryl bromide