A Novel Redox Reaction between 8-Aza-5,7-dimethyl-2-trifluoromethylchromone and Alkyl Mercaptoacetates. Facile Synthesis of CF<sub>3</sub>-Containing 2-Pyridone Derivatives
作者:Vyacheslav Ya. Sosnovskikh、Mikhail A. Barabanov、Boris I. Usachev
DOI:10.1021/jo049117m
日期:2004.11.1
8-Aza-5,7-dimethyl-2-trifluoromethylchromone reacts with alkyl mercaptoacetates in the presence of triethylamine to give pyrido derivatives of 2-oxa-7-thiabicyclo[3.2.1]octane, which undergo the reductive ring opening to alkyl 2-[3-(4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)-3-oxo-1-(trifluoromethyl)propyl]sulfanyl}acetates.The latter can be also obtained directly from 8-aza-5,7-dimethyl-2-trifluoromethylchromone
8-Aza-5,7-二甲基-2-三氟甲基色酮在三乙胺的存在下与巯基乙酸烷基酯反应,生成2-oxa-7-硫代双环[3.2.1]辛烷的吡啶基衍生物,该衍生物经还原性开环反应成烷基2 -[[3-(4,6-二甲基-2-氧代-1,2-二氢吡啶基-3-基)-3-氧代-1-(三氟甲基)丙基]硫烷基}乙酸酯。后者也可以直接从8-氮杂5,7-二甲基-2-三氟甲基色酮,表现为被掩盖的α,β-不饱和酮,4,6-二甲基-3-(4,4,4-三氟丁-2-烯酰基)吡啶-2( 1 H)-一。该化合物是由3-乙酰基-4,6-二甲基-2-吡啶酮独立合成的,并对其合成潜力进行了研究。已经以良好至中等的产率制备了多种包含CF 3基团的2-吡啶酮衍生物。