1,3-Dipolar cycloaddition of azinium ylides to alkynyl hetarenes: a synthetic route to indolizine and pyrrolo[2,1-a]isoquinoline based heterobiaryls
作者:Julia I. Nelina-Nemtseva、Anna V. Gulevskaya、Alexander F. Pozharskii、Huong T.L. Nguyen、Ekaterina A. Filatova
DOI:10.1016/j.tet.2016.03.050
日期:2016.5
For the first time, π-deficient alkynyl hetarenes were used as dipolarophiles in a 1,3-dipolar cycloaddition reaction with in situ generated azinium ylides. A three-component reaction of pyridine or isoquinoline, ethyl chloroacetate and alkynyl hetarene (pyrazine, quinoxaline, uracil, or lumazine derivative) in the presence of a base gave the corresponding indolizine or pyrrolo[2,1-a]isoquinoline based
第一次,在与原位生成的叠氮化物的1,3-偶极环加成反应中,将π缺乏的炔基戊烯用作亲极性。在碱存在下,吡啶或异喹啉,氯乙酸乙酯和炔基戊烯(吡嗪,喹喔啉,尿嘧啶或lumazine衍生物)的三组分反应得到相应的吲哚利嗪或吡咯并[2,1- a ]异喹啉基杂联芳基产量。反应以高区域选择性进行;在所有情况下,C中最缺乏电子的碳原子起始炔基戊烯的C键加到叠氮基内鎓盐的侧链碳上。炔基戊烯与叠氮化或其他1,3-偶极试剂的1,3-偶极环加成反应可以被视为杂联芳基的另一种合成方法。