A stereocontrolled approach to electrophilic epoxides
作者:Otto Meth-Cohn、Clive Moore、Heinrich C. Taljaard
DOI:10.1039/p19880002663
日期:——
Lithium t-butyl hydroperoxide (easily generated by addition of an alkyl-lithium to anhydrous t-butyl hydroperoxide in THF solution) is a powerful reagent for the epoxidation of electrophilic alkenes at –20 to 0 °C under full stereocontrol.
The invention is an algorithm and method for designing an inhibitor that covalently binds a target polypeptide. The algorithm and method can be used to rapidly and efficiently convert reversible inhibitors into irreversible inhibitors.
A novel synthesis of tricyclo[5.1.0.0 3,5 ]octane-2,6-dione derivatives via double Michael addition-induced cyclopropanation reactions
作者:Sadao Tsuboi、Xuan Ye、Katsushi Kunito、Takashige Ono
DOI:10.1016/s0040-4020(01)00180-6
日期:2001.4
Tricyclo[5.1.0.03,5]octane-2,6-diones 1a–q were prepared in moderate yields by the reaction of α,β-unsaturated esters 2 with dihalomethane in the presence of butyllithium, and by the reaction of dichloromethyl α,β-unsaturated ketones 3 with sodium ethoxide, respectively. This reaction was newly explained by a mechanism involving intermolecular double Michael additions of enolate anion 4 of ketones
A mild and efficient one-pot synthesis of esters based on the Pd-catalyzed alkoxy- and aryloxycarbonylation of allylic and benzylic halides is described. The methodology has been applied to primary, secondary, and tertiary alcohols as well as to phenol derivatives. The O-protection of some biologically relevant molecules is also reported. alcohols - allyl halides - benzyl halides - esterification -