Enantioselective synthesis of β-amino acids. Part 9: Preparation of enantiopure α,α-disubstituted β-amino acids from 1-benzoyl-2(S)-tert-butyl-3-methylperhydropyrimidin-4-one
作者:Eusebio Juaristi、Margarita Balderas、Yara Ramı́rez-Quirós
DOI:10.1016/s0957-4166(98)00392-9
日期:1998.11
Double alkylation of enantiopure N,N-acetal pyrimidinone (S)-1, a masked chiral derivative of beta-alanine prepared from (S)-asparagine, proceeds with high stereoselectivity to give C(5) disubstituted adducts (2S,5R)-6, (2S,5S)-6, (2S,5R)-7, and (2S,5S)-7. Acid hydrolysis of these derivatives affords enantiopure alpha,alpha-dialkylated beta-amino acids (R)-8, (S)-8, (R)-9, and (S)-9 in very good yields. (C) 1998 Elsevier Science Ltd. All rights reserved.