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 aliphatic aldehydes 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
将 2-[N-(烷氧基羰基) 氨基] 醛缓慢加入 [V 2 Cl 3 (THF) 6 ] 2 [Zn 2 Cl 6 ] 和脂肪族醛的混合物中,得到 syn,syn-3-[N-(烷氧基羰基)氨基] 1,2-二醇,收率高,对映体纯度高 (>99:1)。N-烷氧基羰基的烷基显示出影响产率:Me>烯丙基>Bn>t-Bu。除了 N-Cbz-丙氨醛 (10:1:1)、O-苄基-N-Cbz-丝氨酸 (7:1) 和 N-Cbz-脯氨酸 (5:1 到 12:1)。一种新的丝氨酸衍生物,N-Cbz-O-TBS-丝氨酸,与正十五醛交叉偶联得到木-DC 18-植物鞘氨醇的衍生物