Highly stereoselective acetylations via norephedrine derived oxazolidines.
摘要:
Norephedrine derived 2-methoxy-2-methyl oxazolidine 2 is an efficient stereoselective acetylating agent in reactions with stereogenic silylenolethers and silylketenethiolacetals. Moderate selectivity is also obtained upon acetylation of crotyltin reagents. The present methodology compares favorably with the previously reported enantioselective Claisen-type acylations.