Study of the oxidation of 3-hydroxypyrroloindoles to pyrrolobenzoxazine alkaloids
作者:Claude Commandeur、Malgorzata Commandeur、Kathell Bathany、Brice Kauffmann、Andrew J.F. Edmunds、Peter Maienfisch、Léon Ghosez
DOI:10.1016/j.tet.2011.09.112
日期:2011.12
in some cases, N-oxides upon treatment with m-CPBA. MS fragmentation (APCI) clearly differentiates formation of N-oxides and oxazines. The N-Boc derivatives exclusively yielded the N-oxides showing that the Meisenheimer rearrangement requires the presence of a high energy lone pair on the neighbouring nitrogen atom. Both the parent compound and the O-Boc derivative gave a mixture of rearranged products
该报告描述了对N-甲基-3-羟基-7-氯吡咯啉吲哚乙酯及其相应的O- Boc和N- Boc衍生物的氧化-迈森海默重排的详细研究。发现了实验条件,其允许叔醇取代基或氨基功能的NH基团的选择性Boc保护。结果表明,无论是母体化合物及其ö -Boc衍生物产生恶嗪的混合物,并且在一些情况下,Ñ -oxides处理后与米-CPBA。MS碎裂(APCI)清楚地区分了N-氧化物和恶嗪的形成。所述Ñ -Boc衍生物仅仅产生的N氧化物表明迈森海默重排需要在相邻的氮原子上存在高能孤对。取决于反应条件,母体化合物和O- Boc衍生物均得到重排产物和N-氧化物的混合物。