Synthesis of Isoquinoline Derivatives by Diels-Alder Reactions of 2(1H)-Pyridones Having an Electron-withdrawing Group with Methoxy-1,3-butadienes.
作者:Reiko FUJITA、Masato HOSHINO、Hiroshi TOMISAWA、Hiroshi HONGO
DOI:10.1248/cpb.48.1814
日期:——
Diels-Alder (DA) reactions of 2(1H)-pyridones having an electron-withdrawing group at the 4-position with 2,3-dimethoxy- and 2-methoxy-1,3-butadienes gave isoquinoline derivatives. Furthermore, an isoquinoline alkaloid (6,7-dimethoxy-2-methyl-1(2H)-isoquinolone) was synthesized by elimination of hydrogen cyanide and dehydrogenation of the DA-adduct having a cyano group at the 4a-position.
在4-位具有吸电子基团的2(1H)-吡啶酮与2,3-二甲氧基-和2-甲氧基-1,3-丁二烯的Diels-Alder(DA)反应得到异喹啉衍生物。此外,通过消除氰化氢和使在4a位具有氰基的DA-加合物脱氢,合成了异喹啉生物碱(6,7-二甲氧基-2-甲基-1(2H)-异喹诺酮)。