Mild air-oxidation of 1,3-dicarbonyl compounds with cesium salts: Novel α-hydroxylation accompanied by partial hydrolysis of malonate derivatives
摘要:
13-Dicarbonyl compounds (1) were: efficiently oxygenated at the alpha-position with cesium salts, such as CsF or Cs2CO3 (0.1 Meq) in DMF at room temperature. Reaction of malonate derivatives (1a, b) with excess amount (2 Meg) of Cs2CO3 gave alpha-hydroxylmonoester (3) formed by oxygenation and partial hydrolysis, which was decarboxylated to a lactic acid derivative (5). (C) 1999 Elsevier Science Ltd. All rights reserved.