Formal enantioselective synthesis of tacamonine starting from asymmetrized 2-substituted propane-1,3-diols
摘要:
2-Substituted propanediols monoacetates, derived from enzymatic asymmetrization of the corresponding diols, have been obtained in high yields and enantiomeric excesses by using lipases and vinyl acetate as both solvent and acylating agent. These chiral building blocks have been transformed into the advanced intermediate 3, useful for the enantioselective synthesis of tacamane alkaloids. (C) 1999 Elsevier Science Ltd. All rights reserved.
An asymmetric synthesis of (+)-lysergic acid methylester was accomplished through construction of the tetracyclic ergoline skeleton by doublecyclization consisting of intramolecular aromatic amination and Heck reaction.
The present invention relates to compounds of the formula (I):
or a pharmaceutically acceptable salt or solvate thereof,
to processes for the preparation of, intermediates used in the preparation of, compositions containing such compounds and the uses of such compounds as antagonists of the NMDA NR2B receptor.
Synthesis of both enantiomeric forms of 2-substituted 1,3-propanediol monoacetates starting from a common prochiral precursor, using enzymatic transformations in aqueous and in organic media
作者:G.M.Ramos Tombo、H.-P Schär、X.Fernandez i Busquets、O Ghisalba
DOI:10.1016/s0040-4039(00)85306-x
日期:——
A direct entry to both enantiomeric forms and based on enzyme catalyzed transformations of prochiral compounds of type and is described. The catalysts used are carboxyl esterase preparations obtained from crude porcine pancreas lipase.