Asymmetric Direct Vinylogous Michael Additions of Allyl Alkyl Ketones to Maleimides through Dienamine Catalysis
作者:Gu Zhan、Qing He、Xin Yuan、Ying-Chun Chen
DOI:10.1021/ol503017h
日期:2014.11.21
A directcatalyticasymmetric γ-regioselective vinylogousMichaeladdition of allyl alkyl ketones to maleimides has been developed through dienamine catalysis of a simple chiral 1,2-diphenylethanediamine, giving multifunctional products in excellent enantioselectivity and with high yields. The success of this catalytic strategy relies on the unique inducing effect of deconjugated β,γ-C═C bond, which
A remote β,γ-regioselective asymmetric inverse-electron-demand oxa-Diels–Alder reaction between allylic ketones and α-cyano-α,β-unsaturated ketones has been developed through induced extended dienamine catalysis of a cinchona-derived primary amine. A spectrum of densely substituted dihydropyran frameworks were efficiently produced with excellent enantioselectivity and fair to exclusive diastereoselectivity
THE ALKYLATION AND BASE-PROMOTED RING-OPENING REACTION OF 3-PHENYLSULFONYL-3-TRIMETHYLSILYLCYCLOBUTANOLS. A NEW METHOD FOR THE PREPARATION OF β-METHYLENE KETONES
作者:Takeshi Takeda、Kazuo Ando、Tooru Fujiwara
DOI:10.1246/cl.1983.1285
日期:1983.8.5
β-Methylene ketones were produced by the alkylation of 1-alkyl-3-phenylsulfonyl-3-trimethylsilylcyclobutanols followed by the treatment with potassium hydride.