作者:Antonio R. Hergueta、Carmen López、Xerardo García-Mera、Franco Fernández
DOI:10.1016/j.tet.2004.08.038
日期:2004.11
The 2-hydroxy and 2-oxo derivatives of 1,2,3,4-tetrahydro-1,4-methanophenazine were prepared and found to evolve in basic media through the opening of their bicyclo[2.2.1]heptene moiety, affording 2,3-dihydro-1H-cyclopenta[b]quinoxaline derivatives with two-carbon 1-substituents that depend on the starting compound. In the case of 2-hydroxy starting compounds, ring-opening occurs regardless of the
制备了1,2,3,4-四氢-1,4-甲吩吩嗪的2-羟基和2-氧代衍生物,并发现它们通过在双环[2.2.1]庚烯部分的打开而在碱性介质中演化,得到2依赖于起始化合物的带有两个碳原子1-取代基的,3-二氢-1 H-环戊基[ b ]喹喔啉衍生物。在2-羟基起始化合物的情况下,无论羟基的取向如何,都会发生开环,并且在甲醇溶液中,即使没有添加碱,它也是自发的,尽管速度很慢(至少在内酰胺的情况下)衍生物)。据推测,它是杂芳基稠合的双环[2.2.1]庚烯部分的空间应变所偏爱的,并且据推测其涉及阴离子中间体的碱促进形成,该中间体通过喹喔啉系统的π-缺陷性质而稳定。