Strictly Regiocontrolled α-Monosubstitution of Cyclic Carbonyl Compounds with Alkynyl and Alkyl Groups via Pd-Catalyzed Coupling of Cyclic α-Iodoenones with Organozincs
derivatives readily undergo Pd-catalyzed cross coupling with α-iodoenones. Although (s-Bu)2Zn also undergoes Pd-catalyzed cross coupling, only the n-Bu-substituted products were obtained. α-Benzylation and α-homobenzylation can proceed satisfactorily, whereas allylzinc and propargylzinc derivatives undergo only addition to the carbonyl group. Although some promising results have been obtained in α-homoallylation
Tandem pericylic reactions (TPR). A simple construction of functionalised [3n,1] bicycles and a ready entry into the core of gibberellic acid and zizaene.
作者:István E Markó、Péter Seres、Graham R Evans、Terry M Swarbrick
DOI:10.1016/s0040-4039(00)79315-4
日期:1993.11
previously reported TPR methodology with an oxidative cleavage reaction, functionalised [3,n,1] bicycles can be produced in good yield. This methodology forms the basis of a simple approach towards the skeleton of gibberellicacid and the zizaenes.
important amidyl radicals from N−H amides is an appealing and yet challenging task. Previous methods require a stoichiometric amount of a strong oxidant and/or a costly noble‐metal catalyst. We report herein the first electrocatalytic method that employs ferrocene (Fc), a cheap organometallic reagent, as the redox catalyst to produce amidyl radicals from N‐aryl amides. Based on this radical‐generating