Harnessing Anionic Rearrangements on the Benzenoid Ring of Quinoline for the Synthesis of 6,6‘-Disubstituted 7,7‘-Dihydroxy-8,8‘-biquinolyls
作者:Paul R. Blakemore、Colin Kilner、Selena D. Milicevic
DOI:10.1021/jo048258l
日期:2005.1.1
7,7‘-Bis(((dimethylamino)carbonyl)oxy)-8,8‘-biquinolyl (5) was prepared in 71% yield by regioselective directed ortho metalation (DoM) of N,N-dimethyl O-quinol-7-yl carbamate (2) with LDA followed by oxidation with anhydrous ferric chloride. DoM of 5 with excess LDA induced double anionic ortho-Fries rearrangement and gave 6,6‘-bis((dimethylamino)carbonyl)-7,7‘-dihydroxy-8,8‘-biquinolyl (8). Treatment
7,7'-双(((二甲氨基)羰基)氧基)-8,8'联喹啉(5)通过区域选择性邻位定向金属化反应(DOM)的以71%的产率制备N,N-二甲基ö -quinol -7-氨基甲酸酯基氨基甲酸酯(2),然后用无水氯化铁氧化。具有过量LDA的5的DoM引起双阴离子邻-弗里斯重排,并且得到6,6'-双((二甲基氨基)羰基)-7,7'-二羟基-8,8'-联喹啉基(8)。的治疗N,N-二乙基ø - (8-双碘喹啉-7-基)氨基甲酸叔丁酯(16)与LDA在-78°C下的THF溶剂中,然后加入无水氯化铁,产生了有效的串联式卤素-舞蹈二聚法,得到7,7'-双((((二乙氨基)羰基)氧基)-6, 6'-二碘-8,8'-联喹啉基(17)直接以54%的产率收率。