An enantioselective one-pot aldol/lactonization sequence has been developed to access highly challenging γ-butyrolactones bearing an all-carbonquaternarystereocenter at the β-position by reacting acylated succinic esters with aqueous formaldehyde in the presence of 3 mol % loading of a cinchona alkaloid-derived squaramide providing direct access to paraconic acid derivatives in high yield and fairly
Quinine analogs as non-peptide calcitonin gene-related peptide (CGRP) receptor antagonists
作者:Robert A. Daines、Kelvin K.C. Sham、Jack J. Taggart、William D. Kingsbury、James Chan、Ann Breen、Jyoti Disa、Nambi Aiyar
DOI:10.1016/s0960-894x(97)10046-4
日期:1997.10
A high-throughput screen identified quinine analog 1 as an antagonist of the human calcitonin gene-related peptide (hCGRP) receptor. Thus, compound 1 displaces [I-125]-CGRP from the hCGRP receptor and inhibits CGRP-mediated cAMP production with IC50 values of 5.9 +/- 1.2 mu M and 26 +/- 5 mu M, respectively. A limited structure-activity study of 1 is described. (C) 1997 Elsevier Science Ltd.