The generation and reaction of a lactone-derived oxiranylanion is described. The aldol-type reaction of the epoxylactone and aldehydes was accomplished by a two-step procedure via the trimethylsilyl epoxylactone. The application of this methodology to the total synthesis of (+)-epolactaene and its analogs is described.
Generation and reaction of an oxiranylanion on a lactone are described. Aldol-type condensation of epoxylactone and aldehydes was accomplished by a two-step procedure via trimethylsilyl epoxylactone.
Enantiomeric β-angelica lactone epoxides: their syntheses from suitable chiral precursors and their use in the preparation of blastmycinone
作者:Rosa M. Ortuño、Daniel Alonso、Jaume Cardellach、Josep Font
DOI:10.1016/s0040-4020(01)86801-0
日期:1987.1
Syntheses of (S)-β-angelica lactone from L-tartaric acid and (R)-γ-hydroxy-methyl-γ-butyrolactone, 5, are reported. Alternative routes to prepare 5 from S- and R-glutamic acids and D-ribonolactone, respectively, are also presented. Epoxides derived from (R)- and (S)-β-angelica lactones have been obtained and their use in the synthesis of both (+)- and (-)-blastmycinone, 24, has been established.
Epolactaene, a neuritogenic compound in human neuroblastoma cells, showed inhibitory activities against DNA polymerases alpha and beta. The synthesis and inhibitory activities of epolactaene analogs are described. The alpha,beta-epoxy-gamma-lactam moiety in the core and the length of the side chain greatly influenced the activities. Compound 5 was the strongest inhibitor of DNA polymerase a and 0 of all synthesized compounds with IC50 values of 13 and 78 muM, respectively. N- and O-alkyl derivatives that had modified core moieties showed moderate inhibition. (C) 2004 Elsevier Ltd. All rights reserved.
Highly stereo and regiocontrolled synthesis of both racemic and optically active (−)-blastmycinone