Synthesis of Substituted 1H- and 3H-1-Benzazepines and Rearrangement of Alkyl 1H-1-Benzazepine-2-carboxylates into Isoquinolines
作者:Vijay Singh、Sanjay Batra
DOI:10.1002/ejoc.200700175
日期:2007.6
reduction of nitro groups in 2-nitro-4-(2-nitrobenzylidene)alkanoates and 4-nitro-2-(2-nitroalkylidene)alkanoates allows the facile synthesis of substituted 1H-1-benzazepines and 3H-1-benzazepines. This reaction proceeds via SN2′ reaction of ethyl nitroacetate and nitroethane with the acetyl derivatives of Baylis–Hillman adducts deriving from 2-nitro-substituted benzaldehydes. During the study, an unprecedented
SnCl2 介导的 2-硝基-4-(2-硝基亚苄基)链烷酸酯和 4-硝基-2-(2-硝基亚烷基)链烷酸酯中硝基的还原允许轻松合成取代的 1H-1-苯并氮杂和 3H-1-苯并氮杂。该反应通过硝基乙酸乙酯和硝基乙烷与源自 2-硝基取代苯甲醛的 Baylis-Hillman 加合物的乙酰衍生物的 SN2' 反应进行。在研究过程中,观察到 1H-benzazepine-2-carboxylate 烷基酯前所未有的重排为取代的异喹啉。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)