Chiral amines in the diastereoselective Mannich-related multicomponent synthesis of diarylmethylamines, 1,2-diarylethylamines, and β-arylethylamines
摘要:
The multicomponent synthesis of diarylmethylamines, 1,2-diarylethylamines and beta-arylethylamines has been undergone starting from aryl- or benzylzinc reagents, aldehydes, and primary or secondary chiral amines. Good to high diastereoselectivities have been obtained from both L-proline ester derivatives 1 and (+/-)-trans-1-allyl-2,5-dimethylpiperazine (4). The use of R-(+)-1-phenylethylamine (7) provides important diastereoisomeric excesses (similar to 60%) in conjunction with very high chemical yields. This work constitutes a preliminary entry to the intended development of a more flexible reaction system, involving easily cleavable chiral amines. (C) 2010 Elsevier Ltd. All rights reserved.
The multicomponent synthesis of diarylmethylamines, 1,2-diarylethylamines and beta-arylethylamines has been undergone starting from aryl- or benzylzinc reagents, aldehydes, and primary or secondary chiral amines. Good to high diastereoselectivities have been obtained from both L-proline ester derivatives 1 and (+/-)-trans-1-allyl-2,5-dimethylpiperazine (4). The use of R-(+)-1-phenylethylamine (7) provides important diastereoisomeric excesses (similar to 60%) in conjunction with very high chemical yields. This work constitutes a preliminary entry to the intended development of a more flexible reaction system, involving easily cleavable chiral amines. (C) 2010 Elsevier Ltd. All rights reserved.