Electrophilic α-formylation of carbonyl compounds using nor-ephedrine-derived 2-metohoxy oxazolidines. A novel asymmetric formation of quaternary stereocenters
Electrophilic α-formylation of carbonyl compounds using nor-ephedrine-derived 2-metohoxy oxazolidines. A novel asymmetric formation of quaternary stereocenters
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.