Base-Catalyzed Transesterification of Thionoesters
作者:Josiah J. Newton、Robert Britton、Chadron M. Friesen
DOI:10.1021/acs.joc.8b02260
日期:2018.10.19
Here we report a convenient synthesis of thionoesters by base-catalyzed transesterification. Benzyl and alkyl thionobenzoates and thionoheterobenzoates were efficiently prepared using various alcohols catalyzed by the corresponding sodium alkoxide. This methodology features a broad substrate scope, good to excellent yields, short reaction times, while simultaneously driving the reaction toward completion
Regioselective Syntheses of 2,3,5-Trisubstituted Pyridines via 5-Chloro-3-fluoro-2-(methylsulfonyl)pyridine
作者:Robert E. Wiley、Martin Holan、Wan Shin Kim、Khoa D. Nguyen、Xingzhong Zeng、Mariusz Krawiec、Andrew T. Brusoe
DOI:10.1021/acs.joc.4c00753
日期:2024.6.7
We report the high-yielding, large-scale, one-pot synthesis of two versatile building blocks (1-Cl and 1-Br) for the regioselectivesynthesis of a variety of 2,3,5-trisubstituted pyridines from inexpensive materials. These molecules are readily derivatized at positions 2, 3, and 5. These building blocks can also be used for the synthesis of fused pyrido-oxazines and for the synthesis of 2,3,4,5-tetrasubstituted
Identification of side chains on 1,2,5-thiadiazole-azacycles optimal for muscarinic M1 receptor activation
作者:Per Sauerberg、Lone Jeppesen、Preben H Olesen、Malcolm J Sheardown、Anders Fink-Jensen、Thøger Rasmussen、Karin Rimvall、Harlan E Shannon、Frank P Bymaster、Neil W DeLapp、Dave O Calligaro、John S Ward、Celia A Whitesitt、Christian Thomsen
DOI:10.1016/s0960-894x(98)00509-5
日期:1998.10
Series of analogs to the functional mi selective agonist, xanomeline (hexyloxy-TZTP), were evaluated for their in vitro ml efficacy in cell lines transfected with the human ml receptor. Systematic variation of the side chain and the azacyclic ring led to the discovery of potent muscarinic agonists with robust ml efficacy, ail having the phenylpropargyloxy/thio as the side chain. The most selective compound was the phenylpropargylthio-[3.2.1] endo analog 28, which is a potent and efficacious mi agonist with no m2 activity. (C) 1998 Elsevier Science Ltd. All rights reserved.
Maillard,J. et al., Chimica Therapeutica, 1970, vol. 5, p. 1 - 9