novel procedure to construct o-naphthothiophenequinones has been achieved from readily available o-benzothiophenquinones and N-dienes via Diels–Alder reaction-aromatization sequence as key steps. The absolute regioselectivity was established via Diels–Alderreaction of o-benzothiophenquinones with rich electron N-dienes.
From a spin-off to the advantageous use in Diels–Alder reactions: a combined synthetic, spectroscopic and computational approach to N-(dienyl)acylamines
The acid-catalyzed condensation of aldehydes and acetamide has been shown to provide a pool of diverse equilibrating species. For the first time, the synthesis of substituted 1-N-acylamino-1,3-butadienes has been accomplished directly in moderate yields upon telomerization of two molecules of aldehyde with one molecule of carboxamide. Detailed spectroscopic and computational investigations establish the favourable formation of all-trans aminodienes under the reaction conditions. Employment thereof as diene building blocks in DielsâAlder reactions allows for the synthesis of carbocyclic molecules with high stereocontrol.
A New Multicomponent Coupling of Aldehydes, Amides, and Dienophiles: Atom-Efficient One-Pot Synthesis of Highly Substituted Cyclohexenes and Cyclohexadienes
作者:Helfried Neumann、Axel Jacobi von Wangelin、Dirk Gördes、Anke Spannenberg、Matthias Beller
DOI:10.1021/ja010503k
日期:2001.8.1
Multi-component coupling reactions of aldehydes and amides with maleic anhydride: synthesis of 7-oxo-6-azabicyclo[3.2.1]oct-2-ene-8-carboxylic acids
作者:Helfried Neumann、Axel Jacobi von Wangelin、Dirk Gördes、Anke Spannenberg、Wolfgang Baumann、Matthias Beller
DOI:10.1016/s0040-4020(02)00116-3
日期:2002.3
A new protocol for the synthesis of a series of 7-oxo-6-azabicyclo[3.2.1]oct-2-ene-8-carboxylic acids from simple aldehydes, amides and maleic anhydride was developed. Key step is an efficient three-component coupling reaction of two molecules of aldehyde with an amide to give a 1-acylamino-1,3-butadiene derivative which easily undergoes Diels–Alder addition to maleic anhydride. Thermic rearrangement