Enantioselective synthesis of a chiral intermediate for aztreonam and related monobactam antibiotics
Abstract
The enantioselective synthesis of trans-(3R,4S)-1-(R)-α-methylbenzyl-3-(2,2,5,5-tetramethyl-1-aza-2,5-disilacyclopentyl)-4-N-(R)-α-methylbenzyliminoazetidin-2-one has been accomplished by reaction of the chiorozinc enolate of an N,N-diprotected glycine ethyl ester with a Chiral α-diimine.