acyclic: The first catalytic, enantioselective, vinylogous Michael reaction of linear, acyclic dienol silyl ethers was achieved. The reaction, based upon the principle of iminium ion catalysis, delivered 1,7‐dioxo compounds in one step with good yields, complete regio‐, and excellent enantioselectivity. γ‐Substituted dienol silyl ethers furnished products with two new stereogenic centers with good diastereoselectivity
An expedient synthesis of functionalized 1,4-diketone-derived compounds via silyloxyallyl cation intermediates
作者:Jacob R. Stepherson、Frank R. Fronczek、Rendy Kartika
DOI:10.1039/c5cc09763k
日期:——
Herein we describe a new method, enabling the synthesis of highly functionalized 1,4-diketones that are readily differentiated as monosilylenol ethers under Bronsted acid catalysis. This synthetically useful chemistry exploited an...
1<i>H</i>,1<i>H</i>-Perfluoroalkylation of Enol Silyl Ethers with (1<i>H</i>,1<i>H</i>-Perfluoroalkyl)phenyliodonium Triflates. A New Method for the Preparation of β- and δ-Trifluoromethyl Carbonyl Compounds and Their Higher Perfluoroalkyl Homologues
作者:Teruo Umemoto、Yoshihiko Gotoh
DOI:10.1246/bcsj.60.3823
日期:1987.10
triflates was promoted successfully by potassium fluoride in dichloromethane at room temperature, giving β-perfluoroalkyl (Rf; CF3, C2F5, i-C3F7, n-C7F15) carbonyl compounds in good yields. An enol silyl ether of an α,β-unsaturated carbonyl compound gave a δ-Rf-α,β-unsaturated carbonyl compound selectively.
Method for conversion of terminal alkenes to aldehydes using ruthenium(IV) porphyrin catalysts
申请人:Che Chi-Ming
公开号:US20060041121A1
公开(公告)日:2006-02-23
Aldehydes were obtained in excellent yields from ruthenium-porphyrin-catalyzed oxidation of various terminal alkenes with 2,6-dichloropyridine N-oxide under mild conditions. The aldehydes generated from these ruthenium-catalyzed alkene oxidation reactions can be used in-situ for olefination reactions with ethyl diazoacetate in the presence of PPh
3
, leading to one-pot diazoacetate olefination starting from alkenes.