Palladium catalysed synthesis of and heterocyclic esters
作者:Robert A. Head、Arthur Ibbotson
DOI:10.1016/s0040-4039(01)81726-3
日期:1984.1
Palladiumcatalysed alkoxycarbonylation of heterocyclic halides affords a simple and versatile synthesis of both N and S heterocyclic esters where a range of catalysts have been studied and a method to employ inexpensive inorganic bases has been found.
The invention provides compounds of formula (I), wherein A, B and R are as defined in the description, and the preparation thereof. The compounds of formula (I) are useful as somatostatin receptor antagonists.
Starting from non-peptidic sst(1)-selective somatostatin receptor antagonists, first compounds with mixed sst(1)/sst(3) affinity were identified by directed structural modifications. Systematic optimization of these initial leads afforded novel, enantiomerically pure, highly potent and sst(3)-subtype selective somatostatin antagonists based on a (4S,4aS,8aR)-decahydroisoquinoline-4-carboxylic acid core moiety. These compounds can efficiently be synthesized and show promising PK properties in rodents. (C) 2010 Elsevier Ltd. All rights reserved.
Syntheses and Certain Reactions of 1-Isoquinolyl and 4-Isoquinolyl Methyl Ketones