separated by flash chromatography. The best results were achieved using a different chiral auxiliary: Oppolzer's camphor sultam. Starting from 1j a good yield in carboxylated product was obtained (80%) with excellent diastereoselectivity (98:2). These chiral alkylmalonic acid derivatives are valuable building blocks in the synthesis of molecules with biological activity and of chiral propane-1,3-diols
Electrochemical Carboxylation of <i>N</i>-(2-Bromopropionyl)-4<i>R</i>- phenyloxazolidin-2-one: An Efficient Route to Unsymmetrical Methylmalonic Ester Derivatives
[GRAPHICS]Electrochemical carboxylation of N-(2-bromopropionyl)-4R-phenyloxazolidin-2-one aimed at the synthesis and chiral resolution of unsymmetrical methylmalonic ester derivatives is described. The presence of the Evans' chiral auxiliary permits an easy resolution of the mixture of the two diastereoisomers.
Electrogenerated Base-Induced N-Acylation of Chiral Oxazolidin-2-ones. 2<sup>1</sup>
An improved and efficient electrochemical N-acylation of chiraloxazolidin-2-ones has been achieved. The generation of the nitrogen anion is obtained under mild conditions and without addition of base or probase, by direct electrolysis of a solution of MeCN-TEAP containing the oxazolidinone. Acylation agents (acid chlorides or anhydrides) were added at the end of the electrolysis. N-Acylated products