A cobalt complex, [CoCl2(dpph)] (DPPH = [1,6-bis(diphenylphosphino)hexane]), catalyzes an intermolecular styrylation reaction of alkyl halides in the presence of Me3SiCH2MgCl in ether to yield beta-alkylstyrenes. A variety of alkyl halides including alkyl chlorides can participate in the styrylation. A radical mechanism is strongly suggested for the styrylation reaction. The sequential isomerization/styrylation
Manganese-Catalyzed Carboacylations of Alkenes with Alkyl Iodides
作者:Caitlin M. McMahon、Matthew S. Renn、Erik J. Alexanian
DOI:10.1021/acs.orglett.6b02154
日期:2016.8.19
A manganese-catalyzed carboacylation of alkenes with alkyliodides and carbon monoxide is described. This carbonylative difunctionalization uses both primary and secondary alkyliodides in reactions with a diverse array of cyclic and acyclic substrates. Examples of successful applications to the synthesis of five-, six-, and seven-membered rings are provided. The inexpensive, first-row catalytic system
Intramolecular Radical Cyclization of 2-Haloethanal Allyl Acetal and Allyl 2-Halophenyl Ether with a Grignard Reagent in the Presence of Iron(II) Chloride
Treatment of 6-iodo-1-hexene derivatives with trimethylsilylmethyl Grignard reagent in the presence of CoCl2(dppb) in refluxing THF affords Heck-type products, methylenecyclopentanes, in good yields.