Palladium-catalyzed reactions of allylic electrophiles with organometallic reagents. A regioselective 1,4-elimination and a regio- and stereoselective reduction of allylic derivatives
Synthese univoque d'amines tertiaires insaturees par voie organometallique a partir de sels d'immonium
作者:G. Courtois、M. Harama、Miginiac
DOI:10.1016/s0022-328x(00)80983-3
日期:1981.9
The best method to prepare unequivocally and in good yields β-acetylenic, α-acetylenic and α-allenic tertiary amines RR′CHNR″2 (R unsaturated group, R′, R″ alkyl groups) from immonium salts has been evaluated.
Efficient and General Aerobic Oxidative Cross-Coupling of THIQs with Organozinc Reagents Catalyzed by CuCl<sub>2</sub>: Proof of a Radical Intermediate
general new method for the highly concise synthesis of C-1-alkylated tetrahydroisoquinolines (THIQ) is reported. The CuCl2-catalyzed procedure is based on a coupling of nonfunctionalized THIQs with organozincreagents under aerobic conditions. It proceeds in high yields and is broadly applicable to a wide range of substrates. It relies on a regioselective sp3 C–H bond activation allowing for an sp3–sp3
Reaction of organozinc halides with aryl isocyanates
作者:Haoran Yang、Danfeng Huang、Ke-Hu Wang、Changming Xu、Teng Niu、Yulai Hu
DOI:10.1016/j.tet.2013.01.053
日期:2013.3
Reformatsky reagent, benzylzinc bromide or alkylzinc iodides react with arylisocyanates directly to give corresponding N-substituted carbamates under mild reaction conditions. However, the reaction of allylzinc bromide or propargylzinc bromide with arylisocyanates produces the corresponding N-substituted amides. The reactions provide alternative methods for the synthesis of N-substituted carbamates
A novel ketone olefination via organozinc reagents in the presence of diphenyl phosphite
作者:Hua Cui、Ying Li、Songlin Zhang
DOI:10.1039/c2ob06821d
日期:——
Carbonyl compounds react with organozinc reagents in the presence of diphenyl phosphite to give the corresponding olefins. A variety of 1,3-dienes and unsaturated esters were obtained in moderate to excellent yields under mild conditions.
Efficient synthetic method for the preparation of allyl- and propargyl-epoxides by allylation and propargylation of α-haloketones with organozinc reagents
作者:Jie Pan、Min Zhang、Songlin Zhang
DOI:10.1039/c1ob06071f
日期:——
A simple, efficient, and non-metal catalyzed synthetic method for the preparation of substituted allyl- and propargyl-epoxides by allylation and propargylation of α-halo ketones with organozinc reagents in mild conditions is reported in this paper. The present method complements the existing synthetic methods due to some advantageous properties of the organozinc reagents such as availability, selectivity, operational simplicity and low toxicity.