Synthesis of [1]benzothieno[3,2-<i>d</i>]pyrimidines substituted with electron donating substituents on the benzene ring
作者:Alexander J. Bridges、Hairong Zhou
DOI:10.1002/jhet.5570340412
日期:1997.7
2-fluorobenzonitriles were converted to the corresponding 3-amino[1]benzothiophenecarboxylic acid esters, which in turn were annulated with formamidine or various equivalents to produce the desired tricyclic benzothienopyrimidines. Various methoxy and nitro/amino substituents were placed on the phenyl ring, requiring several different strategies to prepare the desired benzothiophenes. Several different pyrimidone annulations
将各种2-氟苄腈转化为相应的3-氨基[1]苯并噻吩羧酸酯,然后将其与甲am或各种等价物进行环化,生成所需的三环苯并噻吩并嘧啶。将各种甲氧基和硝基/氨基取代基置于苯环上,需要几种不同的策略来制备所需的苯并噻吩。还需要几种不同的嘧啶酮环化。还描述了在四步一锅式低温锂化过程中使用富电子的2-溴苄腈来生产高度富电子的氨基[1]苯并噻吩羧酸酯。7-氨基-8-氟[1]苯并噻吩并[3,2 - d ]嘧啶-4(3 H)的合成)-一种相对简单,但是合成相应的7-氨基-8-protio类似物非常困难,并且需要多种方法才能找到成功的方法。