Stereoselective dihydropyrido(2,1-a)isoindolone synthesis via diastereodivergent Heck cyclisations on chiral 1,4-dihydropyridines
摘要:
A stereoselective dihydropyrido(2,1-a)isoindolone synthesis is described via diastereodivergent cyclisations by using reductive or non-reductive Heck reactions on chiral 1,4-dihydropyridines. (C) 2001 Elsevier Science Ltd. All rights reserved.
Preparation and Utilization of Chiral Dihydropyridines. Synthesis of Chiral Indoloquinolizines and Benzoquinolizines
摘要:
An asymmetric synthesis of 3-formyl-1,4-dihydropyridines is described that entails the addition of organocopper reagents to activated 3-imidazolidinylpyridine, prepared with chiral diamines. The activator can be a chloroformate or an acid chloride. The methodology was used for the asymmetric syntheses of the indoloquinolizine and benzoquinolizine alkaloid frameworks.
Regio and enantioselective 1,4 addition of ethoxyvinyl copper reagent on a pyridine bearing in position 3 a chiral aminal is described. This reaction allows the synthesis of various chiral N-acyl-4-methoxymethyl-1,4-dihydropyridines.
Preparation of chiral hexahydroquinolizinones and tetrahydroindolizinones by regio- and diastereoselective sonochemical cyclization of chiral dihydropyridines
Chiralhexahydroquinolizinones 13 and tetrahydroindolizinones 17 were prepared from functionalized chiraldihydropyridines by regio- and diastereoselectivesonochemicalcyclization.
Asymmetric synthesis of indoloquinolizidine has been accomplished by using acyl pyridinium salt bearing in 3 position a chiral aminal.
通过使用在手性缩醛的3位上带有酰基吡啶鎓盐,可以完成吲哚并喹喔啉的不对称合成。
Revision of the stereochemistry of the reductive Heck cyclisation of 1-(2-iodobenzoyl)-4-substituted-1.4-dihydro-pyridine-3-carbaldehyde aminals
作者:Pierre Mangeney、Christophe Pays
DOI:10.1016/s0040-4039(03)01384-4
日期:2003.7
The stereochemistry of reductive and non reductive Heck cyclisations of 4-substituted-1.4-dihydropyridines is reexamined. The both reactions occur mainly via an anti (from the C4 substituent) 5-exo process without any epimerisation of the C4-H.