Direct Transformation of Baylis-Hillman Acetates into N-Substituted Quinolones through an SN2′ → SNAr → (Δ3,4-Δ2,3 Shift) → Oxidation Sequence
作者:Muraleedharan Kannoth Manheri、John Napoleon
DOI:10.1055/s-0030-1260189
日期:2011.10
SN2′-SNAr cyclization in the presence of alkyl or aralkyl amines, Baylis-Hillman acetates gave the corresponding 1,2-dihydroquinolines, which on simple exposure to light and oxygen afforded the corresponding 4- and 2-quinolones through sensitized oxidation or a Δ³,4-Δ²,³ shift → oxidation cascade. The mechanism of the oxidation step, the stabilities of the 1,2- and 1,4-dihydroquinolines in solution and
当在烷基或芳烷基胺存在下进行串联S N 2'-S N Ar环化反应时,Baylis-Hillman乙酸酯可得到相应的1,2-二氢喹啉,将其简单地暴露于光和氧气下可得到相应的4-和2喹诺酮类化合物通过敏化氧化或Δ³,4-- Δ² ,³转变→氧化级联反应。讨论了氧化步骤的机理,溶液中和固态的1,2-和1,4-二氢喹啉的稳定性以及关键中间体向已知治疗剂的合成工艺。 抗生素-环化-喹啉-自由基反应-光氧化