Studies directed towards the total synthesis of aldosterone and naturally occurring analogues. A unified approach using the transannular Diels-Alder reaction
作者:Michel Couturier、Yves L Dory、François Rouillard、Pierre Deslongchamps
DOI:10.1016/s0040-4020(97)10393-3
日期:1998.2
A novel approach to the syntheses of aldosterone and naturally occurring analogues thereof is described. The strategy is characterized by a common and highly convergent route using the transannular Diels-Alder reaction of 14-membered TCC macrocyclic trienes as the key step. For this purpose, a novel macrocyclization procedure involving the intramolecular displacement of an α-chloroketone by a β-ketoester
A simpletotalsynthesis of 18-hydroxyestrone () was carried out by the cycloaddition of o-quinodimethane intermediate. 2-Methoxycarbonyl-3-vinyl-cyclopentanone () was used as the D ring component.
Ab initio and semiempirical corroboration of the observed stereoselectivity in the transannular Diels-Alder reaction leading to steroids
作者:Michel Couturier、Yves L Dory、Daniel Fortin、Alain Rouillard、Pierre Deslongchamps
DOI:10.1016/s0040-4020(98)00600-0
日期:1998.8
Various 14-membered macrocyclic trienes underwent transannular Diels-Alder reactions to yield tetracyclic structures that are streoisomers of steroids. Due to the complexity of the effects at work during these reactions, a thorough molecular modeling study was carried out. Thus, some molecular mechanics, semiempirical and db initio methods were compared and the results were finally used to rationalize the experimental results. (C) 1998 Elsevier Science Ltd. All rights reserved.
A regiospecific, convergent route to 2,3-disubstituted cyclopentanones
作者:William A. Nugent、Frank W. Hobbs
DOI:10.1021/jo00174a043
日期:1983.12
Improved route to 3-vinyl substituted cyclopentanones. Synthesis of (.+-.)-mitsugashiwalactone