‘Michael-Michael-Wittig’ Reactions of (2,4-Dioxobutylidene)phosphoranes with 3-Formylchromones
作者:Peter Langer、Edith Holtz
DOI:10.1055/s-2003-37104
日期:——
4-(2′-Hydroxybenzoyl)salicylic esters and amides were prepared by domino ‘Michael-retro-Michael-Wittig’ reactions of (2,4-dioxobutylidene)triphenylphosphoranes with 3-formylchromones.
One-pot reactions of 2,4-(dioxobutylidene)phosphoranes. Efficient synthesis of 4-(2-hydroxybenzoyl)salicylic acid derivatives and buta-1,3-diene-1,4-dicarboxylates
作者:Edith Holtz、Uwe Albrecht、Peter Langer
DOI:10.1016/j.tet.2007.02.062
日期:2007.4
4-(2-Hydroxybenzoyl)salicylic esters and amides were prepared by domino 'Michael-Retro-Michael-Wittig' reactions of (2,4-dioxobutylidene)triphenylphosphoranes with 3-formylchromones.
Synthesis of 2′,4-Diarylbenzophenones through Site-Selective Suzuki-Miyaura Reactions of Bis(triflates) of 2′,4-Dihydroxybenzophenones
Palladium(0)-catalyzed Suzuki cross-coupling reactions of the bis(triflates) of 2′,4-dihydroxybenzophenones afforded 2′,4-diarylbenzophenones. The reactions proceeded with very good site selectivity in favour of the 4-position.
The palladium(0)-catalyzed Suzuki cross-coupling reac- tion of the bis(triflates) of 2¢,4-dihydroxybenzophenones afforded 2¢,4-diarylbenzophenones. The reactions proceeded with very good site selectivity. The first attack occurred at carbon atom C-4.