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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)-(ÃŽÂ±)-methylbenzylamine in dry THF/room temperature/24 hrs. The diastereomeric mixture of 1-[(R)-(ÃŽÂ±)-Methylbenzylamideformyl)]propane-2,3-dicarboxylic acid anhydride 9s and 1-[(R)-(ÃŽÂ±)-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)-(ÃŽÂ±)-methylbenzylamine in the presence of DMA at 0oC for 24 hrs

Facile Synthesis of (R,R) and of (R,S) Tricarballylic Acid Anhydride and Imide Derivatives