Asymmetric synthesis of β2,3-amino acids by InI–Pd(0)-promoted metalation and addition of chiral 2-vinylaziridines
摘要:
The reaction of optically active 3-alkyl-2-vinylaziridines with various aldehydes in the presence of InI and Pd(PPh3)(4) gives rise to chiral syn,syn-2-vinyl-1,3-amino alcohols possessing three contiguous chiral centers stereoselectively. The ratio of the syn,syn-isomer to the other three isomers is significantly affected by the C3-substituents of aziridines as well as the alkyl groups of aldehydes. In addition, the obtained 1,3-aminoalcohols can be converted into biologically important p(2,3)-amino acid derivatives. (C) 2002 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of β2,3-amino acids by InI–Pd(0)-promoted metalation and addition of chiral 2-vinylaziridines
摘要:
The reaction of optically active 3-alkyl-2-vinylaziridines with various aldehydes in the presence of InI and Pd(PPh3)(4) gives rise to chiral syn,syn-2-vinyl-1,3-amino alcohols possessing three contiguous chiral centers stereoselectively. The ratio of the syn,syn-isomer to the other three isomers is significantly affected by the C3-substituents of aziridines as well as the alkyl groups of aldehydes. In addition, the obtained 1,3-aminoalcohols can be converted into biologically important p(2,3)-amino acid derivatives. (C) 2002 Elsevier Science Ltd. All rights reserved.
Treatment of optically active 3-alkyl-2-vinylaziridines 1, 8 and 9 and allylic acetates 10 and 11 with InI in the presence of Pd(PPh3)(4) gives rise to chiral allylindiums bearing an amino group at the delta -position, which react with several aldehydes in highly regio- and stereoselective manner to afford the syn,syn-2-vinyl-1,3-amino alcohols 2a, 5a-7a and 12a-14a possessing three contiguous chiral centers in good yields. (C) 2001 Elsevier Science Ltd. All rights reserved.
Asymmetric synthesis of β2,3-amino acids by InI–Pd(0)-promoted metalation and addition of chiral 2-vinylaziridines
The reaction of optically active 3-alkyl-2-vinylaziridines with various aldehydes in the presence of InI and Pd(PPh3)(4) gives rise to chiral syn,syn-2-vinyl-1,3-amino alcohols possessing three contiguous chiral centers stereoselectively. The ratio of the syn,syn-isomer to the other three isomers is significantly affected by the C3-substituents of aziridines as well as the alkyl groups of aldehydes. In addition, the obtained 1,3-aminoalcohols can be converted into biologically important p(2,3)-amino acid derivatives. (C) 2002 Elsevier Science Ltd. All rights reserved.