The condensation of N-acylated amino acids with polymer-supported cyclic malonic acid ester was carried out in the presence of DCC/DMAP. The cyclisation of the intermediate resin, by heating in an organic solvent, gave the N-protected tetramic acid derivatives in good yields and high purity. (C) 2003 Elsevier Ltd. All rights reserved.
A new approach to N-protected staurosporinones
作者:Maria M.M. Santos、Ana M. Lobo、Sundaresan Prabhakar、M.Manuel B. Marques
DOI:10.1016/j.tetlet.2004.01.089
日期:2004.3
A completely regioselective synthesis of two advanced precursors to glycosidic indolopyrrolo[2,3-a]carbazole alkaloids is described. (C) 2004 Elsevier Ltd. All rights reserved.
KATO T.; SUZUKI Y.; SATO M., CHEM. AND PHARM. BULL., 1979, 27, NO 5, 1181-1185