Synthesis of Allyl- and Prenylcoumarins via Microwave-Promoted Tandem Claisen Rearrangement/Wittig Olefination
作者:Bernd Schmidt、Martin Riemer
DOI:10.1055/s-0035-1560501
日期:——
sequence of Claisen rearrangement, carbonyl olefination, and cyclization upon microwave irradiation in the presence of a stabilized ylide. The products are multiply substituted 6- or 8-allylated or prenylated coumarins (2H-chromen-2-ones). Allyl, dimethylallyl, crotyl, and prenyl ethers of various aromatic ortho-hydroxy carbonyl compounds undergo a tandem sequence of Claisen rearrangement, carbonyl olefination
摘要 各种芳族邻羟基羰基化合物的烯丙基,二甲基烯丙基,巴豆基和异戊烯基醚在稳定的内酯存在下进行微波辐射后,会经历克莱森重排,羰基烯烃化和环化的串联序列。产物是被多重取代的6-或8-烯丙基化或烯丙基化的香豆素(2 H -chromen-2-ones)。 各种芳族邻羟基羰基化合物的烯丙基,二甲基烯丙基,巴豆基和异戊烯基醚在稳定的内酯存在下进行微波辐射后,会经历克莱森重排,羰基烯烃化和环化的串联序列。产物是被多重取代的6-或8-烯丙基化或烯丙基化的香豆素(2 H -chromen-2-ones)。