Expeditious and highly efficient protocol for the synthesis of novel diversely substituted thieno[2,3-b]thiophene
作者:Yahia Nasser Mabkhot、Assem Barakat、Saeed Alshahrani
DOI:10.1016/j.molstruc.2012.05.056
日期:2012.11
Nevertheless, facile reaction sequences for the preparation of 6 , 7 , 8a-c , and 9a - c starting with 1,1′-(3-methyl-4-phenylthieno[2,3- b ]thiophene-2,5-diyl)diethanone 1 have been developed. Finally, several bis-heterocycles 10a-f were synthesized through a stepwise formation of hydrazone followed by a Michael 1,4-addition of the nucleophile nitrogen atom and provides a convenient access to an important
摘要 1,1'-(3-Methyl-4-phenylthieno[2,3-b]thiophene-2,5-diyl)bis(4,4,4 triethoxybut-2-en-1-one)-3据报道,烯胺酮衍生物 2 与原甲酸三乙酯以相当高的收率进行一锅反应。描述了迄今为止未知的双羟基胺衍生物 4 在碱性条件下通过 N-亲核试剂。此外,在催化量的 AcONH 4 的帮助下,通过使用 AcOH 环化烯胺酮衍生物 2 合成了新型化合物 5。然而,制备 6、7、8a-c 和 9a-c 的简便反应序列始于1,1'-(3-methyl-4-phenylthieno[2,3-b]thiophene-2,5-diyl)diethanone 1 已被开发出来。最后,通过逐步形成腙,然后是迈克尔 1,合成了几个双杂环 10a-f,