Diels–Alder reactions for the rational design of benzo[b]thiophenes: DFT-based guidelines for synthetic chemists
作者:Romina Brasca、María N. Kneeteman、Pedro M.E. Mancini、Walter M.F. Fabian
DOI:10.1016/j.molstruc.2011.11.050
日期:2012.2
In this work we studied the capability of several diene/dienophile pairs to undergo Diels-Alder (DA) reactions leading to benzo[b]thiophenes. A variety of synthetically and commercially available nitrothiophenes were chosen as dienophiles. Methyl 5-nitro-3-thiophenecarboxylate was selected as a potential strong electrophilic candidate based on some DFT-based properties and the substitution pattern of the expected product. The mechanistic details concerning the participation of this dienophile in polar DA reactions were investigated through a theoretical point of view. The results were compared with the experimental outcomes. This methodology should allow synthetic chemists to analyze DA reactions in detail in a stage prior to the synthetic job. (C) 2011 Elsevier B.V. All rights reserved.