A New Entry to Azomethine Ylides from Allylic Amines and Glyoxals: Shifting the Reliance on Amino Ester Precursors
作者:Natalie K. Machamer、Xiaoxi Liu、Stephen P. Waters
DOI:10.1021/ol5022614
日期:2014.10.3
examples of azomethine ylides derived from allylic amine and glyoxal precursors are reported. The condensation of primary allylic and α-aryl amines with glyoxylates or α-aryl glyoxals affords conjugated azomethine ylides that undergo facile [3 + 2] cycloaddition, providing 5-alkenyl pyrrolidine cycloadducts that cannot be accessed through the classical use of amino esters as ylide precursors.
Compounds having the formula:
wherein n is 0, 1 or 2;
X is OH or OCOR2m wherein R2 is hydrogen or (C,-C.) alkyl;
R is hydrogen, a radical group forming an ester hydrolyzable under physiological conditions, or an acyloxymethyl or 1-(acyloxy)ethyl radical derived from a convential beta-lactam antibiotic; and
R' is selected from a wide range of alkyl, cycloalkyl, aryl, aralkyl, heterocyclyl or heterocyclylalkyl groups
and their pharmaceutically acceptable salts.
These compounds are useful as antibacterials and/or beta-lactamase inhibitors.