Graphite intercalation compounds as precursors of activated metals
作者:P. Marceau、L. Gautreau、F Béguin、G. Guillaumet
DOI:10.1016/0022-328x(91)83083-g
日期:1991.2
compound was used as metallic agent for the synthesis of various ν,γ-unsaturated ketones from nitriles and a allylichalide. In aromatic series, the reaction is not influenced by the groups present on the ring of the nitrile. The most striking feature of the reaction is that the chloro and bromo parent reagents have comparable reactivities; this is attributed to the fact that the reaction of the activated
Reaction of acid chlorides with lithium pentamethylcyclopentadienide afforded the corresponding pentamethyl-cyclopentadienyl ketones in high yield. These ketones were treated with an allylaluminum reagent to form the corresponding 3-butenyl alcohols. Removal of pentamethylcyclopentadiene upon heating or treatment with a catalytic amount of trichloroacetic acid yielded the corresponding β,γ-unsaturated
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
to a valuable building block for the total synthesis of phytotoxicnonenolideputaminoxin. The enzymatic approach towards the enantioenriched homoallylic alcohol was compared to classical, nonenzymatic approaches using asymmetric reagent controlled allyl additions and the obtained building block was used for the total synthesis of putaminoxin and its (5S,6E,9S)-diastereomer. After the spectroscopic