Et<sub>3</sub>B-mediated and palladium-catalyzed direct allylation of β-dicarbonyl compounds with Morita–Baylis–Hillman alcohols
作者:Ahlem Abidi、Yosra Oueslati、Farhat Rezgui
DOI:10.3762/bjoc.12.234
日期:——
A practical and efficient palladium-catalyzed direct allylation of beta-dicarbonylcompounds with both cyclic and acyclic Morita-Baylis-Hillman (MBH) alcohols, using Et3B as a Lewis acid promoter, is described herein. A wide range of the corresponding functionalized allylated derivatives have been obtained in good yields and with high selectivity.
Cyclic α-(nitroalkyl)enones and α-(phenylsulfonylalkyl)enones undergo regioselective substitution of the nitrogroup by relatively soft sulfur, nitrogen and carbon nucleophiles.
Regiospecific carbon—carbon bond formation at α and β positions in cyclic ketones via double Michael addition to α-methylene-β-alkoxy cyclic ketone
作者:Takashi Takahashi、Kimihiko Hori、Jiro Tsuji
DOI:10.1016/0040-4039(81)80164-5
日期:——
Very reactive 2-methylene-3-alkoxycyclohexanone was synthesized. The 1,4-conjugate addition of various nucleophiles to this enone gave only β′-alkylated 2-cyclohexenone with simultaneous elimination of the β-alkoxy group. The second 1,4-conjugate addition of other nucleophile to the resulting cyclohexenone leads to the α and β disubstituted ketones.