Facile Synthesis of (R,R) and of (R,S) Tricarballylic Acid Anhydride and Imide Derivatives
作者:Abdel-Sattar Elgazwy
DOI:10.3390/50400665
日期:——
The diastereomeric mixture of (R)-2-(methoxycarbonylmethyl)-N-(R)-1-(1-phenylethyl) succinimide 11s and (S)-2-(methoxycarbonylmethyl)-N-(R)-1-(1-phenylethyl) succinimide 11a was synthesized by reaction of 2-(carboxymethyl)succinic anhydride 6 with (R)-(α)-methylbenzylamine in dry THF/room temperature/24 hrs. The diastereomeric mixture of 1-[(R)-(α)-Methylbenzylamideformyl)]propane-2,3-dicarboxylic acid anhydride 9s and 1-[(R)-(α)-methylbenzylamideformyl)]propane-2,3-dicarboxylic acid anhydride 9a was isolated as an intermediate under the reaction conditions. This diastereomeric mixture 9s/9a was also prepared by a different route via reaction of 1-(chloroformyl)propane-2,3-dicarboxylic acid anydride 12 with (R)-(α)-methylbenzylamine in the presence of DMA at 0oC for 24 hrs.
(R)-2-(甲氧羰基甲基)-N-(R)-1-(1-苯基乙基)琥珀酰亚胺 11s 和(S)-2-(甲氧羰基甲基)-N-(R)-1-(1-苯基乙基)琥珀酰亚胺 11a 的非对映混合物是由 2-(羧甲基)琥珀酸酐 6 与(R)-(α)-甲基苄胺在干燥的 THF/室温下反应 24 小时合成的。在反应条件下,分离出 1-[(R)-(α)-甲基苄酰胺甲酰基)]丙烷-2,3-二羧酸酐 9s 和 1-[(R)-(α)-甲基苄酰胺甲酰基)]丙烷-2,3-二羧酸酐 9a 的非对映混合物作为中间体。这种非对映异构体混合物 9s/9a 也是通过另一种方法制备的,即 1-(氯甲酰基)丙烷-2,3-二羧酸酐 12 与(R)-(α)-甲基苄胺在 DMA 存在下于 0oC 反应 24 小时。