Towards the total synthesis of manzamines. Rapid and efficient assembly of a middle core model
摘要:
The tetracyclic system 9, a simple model for the middle portion of the antitumour alkaloids manzamines, has been readily prepared, using a unique anionic cyclisation strategy.
Tryptophan-derived selective nanomolar butyrylcholinesterase inhibitors with great potential for symptomatic therapy against Alzheimer's disease are disclosed.
Novel cinnamamide derivatives and the salts thereof are provided. An antihyperlipidemic composition is also provided. The composition comprises an active ingredient which is at least one selected from the group consisting of the above-mentioned cinnamamide derivative and the pharmaceutically acceptable salt thereof.
Novel anionic polycyclisation cascade. Highly stereocontrolled assembly of functionalised tetracycles akin to the middle core of the manzamines
作者:Laurent Turet、István E. Markó、Bernard Tinant、Jean-Paul Declercq、Rolland Touillaux
DOI:10.1016/s0040-4039(02)01463-6
日期:2002.9
Substituted gramines, in the presence of iotaBuOK, react with acrolein and beta-keto-phosphonates, via a novel sequence involving a multicomponent condensation followed by an anionic polycyclisation cascade, to afford in excellent overall yields, highly functionalised tetracyclic structures akin to the middle core of the manzamines. In this unique process, Lip to eight elementary transformations take place with remarkably high chemo- and stereocontrol. (C) 2002 Elsevier Science Ltd. All rights reserved.