作者:Martha S. Morales-Ríos、María A. Bucio、Pedro Joseph-Nathan
DOI:10.1016/0040-4020(96)00176-7
日期:1996.4
The formal synthesis of the indolealkaloid (±)-physostigmine (1) from (Z)-2-hydroxy-5-methoxyindolenine9 is described. The key step of the synthesis is a novel diasteroselective conjugated addition of a Grignard reagent to 9. The relative stereochemistry of the newly formed contiguous chiral centers is established by X-ray crystallography. The stereocontrolled conjugated addition involves the directing
Stereocontrolled synthesis of 3-alkylindolines from (Z)-2-hydroxyindolenines
作者:M. S. Morales-R�os、C. Garc�a-Mart�nez、M. A. Bucio、P. Joseph-Nathan
DOI:10.1007/bf00817260
日期:——
A convenient process for the synthesis of 3-alkylindolines 2 and their transformation into cis-fused tricyclic gamma-lactones 3 from allylic alcohols 1, mediated by a Grignard reagent, is described. This process proceeds with high stereocontrol at the two newly formed contiguous stereogenic centres. By oxidation with chromium oxide, 2-oxindole derivatives 4 are obtained from 3-alkylindolines 2.
General Approach to the Synthesis of Marine Bryozoan <i>Flustra foliacea</i> Alkaloids: Total Syntheses of Debromoflustramines A and B
作者:Martha S. Morales-Ríos、Oscar R. Suárez-Castillo、Pedro Joseph-Nathan