摘要:
3(S) and 3(R)-Benzyloxycarbonyl-pentanedioic acid mono-tert-butyl esters (6) were obtained as enantiopure orthogonally protected tricarballylic acid (TCA) esters. These were synthesised by alkylation of the sodium enolate derived from chiral but-3-enoyloxazolidinone imides (3) with tert-butyl bromoacetate; following the hydrolysis to remove the chiral auxiliary, benzyl esterification afforded the 2-allyl succinic acid diesters (4) that were converted to protected TCA esters after oxidation of the double bond. (C) 2000 Elsevier Science Ltd. All rights reserved.