Pinacol Cross Coupling of 2-[N-(Alkoxycarbonyl)amino] Aldehydes and Aliphatic Aldehydes by [V2Cl3(THF)6]2[Zn2Cl6]. Synthesis of syn,syn-3-[N-(Alkoxycarbonyl)amino] 1,2-Diols
作者:Andrei W. Konradi、Scott J. Kemp、Steven F. Pedersen
DOI:10.1021/ja00083a017
日期:1994.2
Slow addition of 2-[N-(alkoxycarbonyl)amino] aldehydes to mixtures of [V 2 Cl 3 (THF) 6 ] 2 [Zn 2 Cl 6 ] and aliphaticaldehydes gave syn,syn-3-[N-(alkoxycarbonyl)amino] 1,2-diols in good yield and high enantiomeric purity (>99:1). The alkyl group of the N-alkoxycarbonyl was shown to influence the yield: Me >allyl>Bn>t-Bu. Only the syn,syn diastereomer was observed (>20:1), except with N-Cbz-alaninal
A concise synthesis of (+)-preussin (1), an antifungal agent and a growth-inhibitor of fission yeast and human cancer cells, was accomplished employing a stereoselective aldol reaction between the zinc enolate of 2-undecanone and N-protected-L-phenylalaninal followed by reductive pyrrolidine formation as key steps. (C) 2001 Elsevier Science Ltd. All rights reserved.