Diastereoselective synthesis of β-lactams via Kinugasa reaction of acyclic chiral nitrones
摘要:
An approach to beta-lactams via a Kinugasa reaction between chiral copper acetylides and chiral acyclic nitrones bearing either 1,3-dioxane or 1,3-dioxolane moieties is reported. The stereochemical preferences observed in these reactions are discussed. The reaction provides access to a variety of interesting beta-lactam structures. Electronic circular dichroism in combination with NMR spectroscopy was shown to be a useful and effective method for the reliable determination of the absolute configuration of all components of a complex mixtures of azetidinones. The effectiveness of the chiral analysis of complex mixtures was demonstrated for HPLC coupled on-line with electronic circular dichroism detection as well. (C) 2015 Elsevier Ltd. All rights reserved.
Modular Synthesis of the C9−C27 Degradation Product of Aflastatin A via Alkyne−Epoxide Cross-Couplings
作者:Omar Robles、Frank E. McDonald
DOI:10.1021/ol800659z
日期:2008.5.1
A modular approach to the synthesis of complex polyketide natural products is demonstrated for the synthesis of the C9-C27 degradationproduct from aflastatin A. The product of the cross-coupling of C23-C27 terminal alkyne with C17-C22 epoxide underwent functionalization of the resulting internal alkyne, which was then coupled similarly with C9-C16 epoxide. This synthesis concluded with regio- and
[EN] METHOD FOR PREPARING INGENOL-3-HEXANOATE, METHOD FOR PREPARING 3-ETHYNYL-3-HYDROXY-4,7,7-TRIMETHYLBICYCLO[4.1.0]HEPTANE-2-CARBALDEHYDE, AND METHOD FOR PREPARING THE COMPOUND 2,2-DIMETHYL-4-ETHYNYL-5-TRIPHENYLPHOSPHORUS ANYLIDENE-1,3-DIOXANE<br/>[FR] PROCÉDÉ DE PRÉPARATION D'INGÉNOL-3-HEXANOATE, PROCÉDÉ DE PRÉPARATION DE 3-ÉTHYNYL-3-HYDROXY-4.7.7-TRIMÉTHYLBICYCLO[4.1.0]HEPTANE-2-CARBALDÉHYDE ET PROCÉDÉ DE PRÉPARATION DU COMPOSÉ 2,2-DIMÉTHYL-4-ÉTHYNYL-5-TRIPHÉNYLPHOSPHORANYLIDÈNE-1,3-DIOXANE<br/>[PT] MÉTODO DE PREPARAÇÃO DE INGENOL-3-HEXANOATO, MÉTODO DE PREPARAÇÃO DE 3-ETINIL-3-HIDROXI-4.7.7-TRIMETILBICICLO[4.1.0]HEPTANO-2-CARBALDEÍDO E MÉTODO DE PREPARAÇÃO DO COMPOSTO 2,2-DIMETIL-4-ETINIL-5-TRIFENILFOSFORANILIDENO-1,3-DIOXANO
申请人:AMAZÔNIA FITOMEDICAMENTOS LTDA
公开号:WO2016191837A1
公开(公告)日:2016-12-08
A presente invenção refere-se a método de preparação de ingenol-3-hexanoato assim como ingenol-3-hexanoato obtido por tal processo.