SYNTHESIS OF CYCLOPENTENE-FUSED PYRROLOISOQUINOLINONE DERIVATIVE VIA<i>N</i>-ACYLIMINIUM ION CYCLIZATION
作者:Dong Jin Hwang、Soo Sung Kang、Jae Yeol Lee、Jung Hoon Choi、Hokoon Park、Yong Sup Lee
DOI:10.1081/scc-120003411
日期:2002.1
pyrrolo[2,1-a]isoquinolinone derivative 7 was prepared. C-4 Hydroxylated 5-ethoxylactam 1b gave 4,5-epoxylactam 2 in high yield instead of isoquinoline derivative 3b under the N-acyliminium ion cyclization condition. The 4,5-epoxylactam 2 was converted to another N-acyliminium ion precursor 6 through base-promoted epoxide ring opening, silylation, and thermal Diels–Alder reaction with cyclopentadiene in
摘要 本研究制备了一类新的吡咯并[2,1-a]异喹啉酮衍生物7。C-4羟基化5-乙氧基内酰胺1b在N-酰基胺离子环化条件下以高产率得到4,5-环氧内酰胺2而不是异喹啉衍生物3b。4,5-环氧内酰胺 2 通过碱促进的环氧化物开环、硅烷化和与环戊二烯的热 Diels-Alder 反应以高产率转化为另一种 N-酰基胺离子前体 6。最后,化合物 6 在 TiCl4 存在下环化,得到环戊烯稠合的吡咯并异喹啉衍生物 7。