Synthesis of Diverse 2,3-Dihydroindoles, 1,2,3,4-Tetrahydroquinolines, and Benzo-Fused Azepines by Formal Radical Cyclization onto Aromatic Rings
作者:Derrick L. J. Clive、Jianbiao Peng、Stephen P. Fletcher、Vincent E. Ziffle、David Wingert
DOI:10.1021/jo7026307
日期:2008.3.1
represents formal radical cyclization onto aromatic rings. Optically pure benzo-fused heterocycles are also accessible by this method. p-Iodophenols, especially those with the phenolic oxygen protected as a MOM-ether, can be coupled with amino alcohols to produce N-aryl amino alcohols, which can be converted into the corresponding alkyl iodides in which the nitrogen is protected as a carbamate. These compounds
2,3-二氢吲哚,1,2,3,4-四氢喹啉和2,3,4,5-四氢苯并[ b ]氮杂可以通过代表将自由基正式环化到芳环上的方法获得。光学纯的苯并稠合的杂环也可通过该方法获得。对碘苯酚,特别是那些具有被保护为MOM醚的酚氧的对碘苯酚,可以与氨基醇偶联生成N-芳基氨基醇,可以将其转化为相应的烷基碘化物,其中的氮被保护为氨基甲酸酯。这些化合物在除去酚类保护基并在MeOH存在下用PhI(OAc)2氧化后得到交联的酮。酮经历5、6或7- exo-三角自由基环化,然后暴露于酸中,或先后用格氏试剂然后再酸进行处理,重新进行麦芽糖化处理,生成苯并稠合的氮杂环。