system can be effectively accomplished by reaction of allyltributyltin with 3,4-dihydroisoquinoline activated by 2-oxo-2H-pyran-6-ylcarbonyl chloride. Allyltributyltin reacts similarly with 3,4-dihydro-β-carboline activated by 2-oxo-2H-pyran-6-ylcarbonyl chloride to gave the corresponding 1,2-adduct. Intramolecular Diels–Alder reactions of the 1,2-adducts followed by DDQ oxidations afford 8-oxoprotoberberine
通过
烯丙基三丁基锡与 2-氧-
2H-吡喃-6-基羰基活化的
3,4-二氢异喹啉反应,可以有效地将烯丙基和 2-氧-
2H-吡喃-6-基羰基引入
异喹啉体系中
氯化物。
烯丙基三丁基锡与由 2-氧代-
2H-吡喃-6-基羰基
氯活化的 3,4-二氢-β-咔啉类似地反应,得到相应的 1,2-加合物。1,2-加合物的分子内 Diels-Alder 反应,然后是
DDQ 氧化,得到 8-氧代原
小檗碱和去甲酮比林。