three-component couplingreaction of aldehydes, 1,3-dienes, and alkenylzirconium reagents was realized. The ligand- and additive-free protocol afforded a convenient approach to the synthesis of skipped diene compounds bearing various functionals (e.g., hydroxyl, carbonyl, halide) and heterocyclic groups. The products were readily transformed into structurally diverse polyenes. The utility of this reaction was
Reaction of 1-(chloromethyldimethylsilyl)-1-alkyne with triisobutylaluminium gives 2-(isobutyldimethylsilyl)-1-alkene exclusively. Reactions of the lithiated allylsilane with several electrophiles give the corresponding carbometallated products, allylsilanes bearing alkyl, allyl, vinyl, or alkoxycarbonyl groups. Protodesilylation of 3-(trimethylsilylmethyl)-1,3-decadiene gives 3-methylene-1-decene selectively
An intermolecular nickel-catalyzed decarbonylative [4 + 2] cycloaddition has been developed where phthalic anhydrides react with 1,3-dienes to afford substituted 3-vinyldihydroisocoumarins.
Copper-Catalyzed Markovnikov Selective 3,4-Hydrosilylation of 2-Substituted 1,3-Dienes
作者:Ying Wang、Zi-Lu Wang、Wei-Wei Ma、Yun-He Xu
DOI:10.1021/acs.orglett.2c01558
日期:2022.6.10
A copper-catalyzed regioselective Markovnikov 3,4-hydrosilylation of 2-substituted 1,3-dienes has been accomplished. A wide range of 2-substituted 1,3-dienes and trihydrosilanes are compatible under the optimal conditions. The bisphosphine ligand with a rigid backbone provides the Markovnikov 3,4-hydrosilylation product in better yield and selectivity. Besides, the synthetic utilities of the allylsilanes
We herein report a Ni-catalyzed three-component cross-electrophile coupling of 1,3-dienes with aldehydes and arylbromides using manganese metal as the reducing agent. This efficient protocol accomplishes dicarbofunctionalization of 1,3-dienes to synthesize diverse structural 1,4-disubstituted homoallylic alcohols by forming two new C–C bonds in one time. Mechanistic study suggests that an allyl-nickel(I)
我们在此报道了使用锰金属作为还原剂的 1,3-二烯与醛和芳基溴化物的 Ni 催化的三组分交叉亲电偶联。这种有效的方案通过一次形成两个新的 C-C 键来完成 1,3-二烯的二碳官能化,从而合成不同结构的 1,4-二取代高烯丙醇。机理研究表明,烯丙基镍 (I) 物种参与了催化循环。