名称:
A novel method for the synthesis of (R)-2,2′-dihydroxy-1,1′-binaphthyl-3,3′-dicarboxylic acid by asymmetric oxidative coupling of a chiral β-naphthol derivative catalyzed by CuCl
摘要:
Asymmetric oxidative coupling of (S)-1-(3-hydroxy-2-naphthylcarbonyl)pyrrolidine-2-carboxylic acid methyl ester 1 catalyzed by CuCl afforded (S,S,R)-2,2'-dihydroxy-3,3'-bis(2-methoxycarbonyl-1-pyrrolidinylcarbonyl)-1,1'-binapthalene 2 with diastereomeric excess up to 65.9%. (R)-BINOL-3,3'-diacid 3 was obtained in 30% overall yield and 97% e.e. by separating the diastereomers and hydrolyzing 2. (C) 2002 Elsevier Science Ltd. All rights reserved.