Regio- and <i>Trans</i>-Selective Ni-Catalyzed Coupling of Butadiene, Carbonyls, and Arylboronic Acids to Homoallylic Alcohols under Base-Free Conditions
作者:Yu-Qing Li、Guang Chen、Shi-Liang Shi
DOI:10.1021/acs.orglett.1c00488
日期:2021.4.2
We herein report a Ni-catalyzed three-component coupling of 1,3-butadiene, carbonylcompounds, and arylboronic acids as a general synthetic approach to 1,4-disubstituted homoallylic alcohols, an important class of compounds, which have previously not been straightforward to access. The reaction occurs efficiently using a Ni(cod)2 catalyst without any external base and ligand at ambient temperature
Nickel-catalysed three-component connection reaction of a phenyl group, conjugated dienes, and aldehydes: stereoselective synthesis of (E)-5-phenyl-3-penten-1-ols and (E)-3-methyl-5-phenyl-3-penten-1-ols
presence of 10 mol% of Ni(acac)2, Ph2Zn reacts with 1,3-butadiene and aldehydes at room temperature to give 1-alkyl and 1-aryl substituted (E)-5-phenyl-3-penten-1-ols (3) in good yields. Under similar conditions, the three components of Ph3BZnEt2, isoprene, and aldehydes combine with each other to furnish 1-alkyl and 1-aryl substituted (E)-3-methyl-5-phenyl-3-penten-1-ols (5) in good yields.
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。