Facile Diastereoselective Reactions of Chiral 1,3-Oxazolidines with Grignard Reagents; Asymmetric Syntheses of 2-Substituted and 2,6-Disubstituted Piperidines
Facile Diastereoselective Reactions of Chiral 1,3-Oxazolidines with Grignard Reagents; Asymmetric Syntheses of 2-Substituted and 2,6-Disubstituted Piperidines
Facile Diastereoselective Reactions of Chiral 1,3-Oxazolidines with Grignard Reagents; Asymmetric Syntheses of 2-Substituted and 2,6-Disubstituted Piperidines
Stereocontrolled Addition of Grignard Reagents to Chiral 1,3-Oxazolidines Having N-Methoxybenzyl Groups: Effect of N-Substituent in Diastereoselectivity
Chiral 1,3-oxazolidines having various N-methoxybenzyl groups were synthesized from (R)-phenylglycinol in three steps. The reactions of chiral 1,3-oxazolidines with Grignard reagents proceeded gently to give the corresponding chiral amines in quantitative yield and high diastereoselectivity. The best results regarding diastereoselectivity were achieved using a chiral 1,3-oxazolidine having N-2,4,6-trimethoxybenzyl moiety. These nitrogen functional groups could be easily removed from the chiral amines using TFA.