complex catalyzed α-alkylation of arylacetonitriles using secondary alcohols with the liberation of water as the only byproduct is reported. The α-alkylations were efficiently performed at 120 °C under solvent-free conditions with very low (0.1–0.01 mol %) catalyst loading. Various secondary alcohols including cyclic and acyclic alcohols and a wide variety of arylacetonitriles bearing different functional
Enantioselective Rhodium-Catalyzed Allylic Alkylation of Prochiral α,α-Disubstituted Aldehyde Enolates for the Construction of Acyclic Quaternary Stereogenic Centers
作者:Timothy B. Wright、P. Andrew Evans
DOI:10.1021/jacs.6b10099
日期:2016.11.30
highly enantioselective rhodium-catalyzed allylic alkylation of prochiral α,α-disubstituted aldehyde enolates with allyl benzoate is described. This protocol provides a novel approach for the synthesis of acyclic quaternary carbon stereogenic centers and it represents the first example of the direct enantioselective alkylation of an aldehyde enolate per se. The versatility of the α-quaternary aldehyde
Nickel(II) complex 1 was utilized as a sustainable catalyst for α-alkylation of arylacetonitriles with challenging secondary alcohols. Arylacetonitriles with a wide range of functional groups were tolerated, and various cyclic and acyclic secondary alcohols were utilized to yield a large number of α-alkylated products. The plausible mechanism involves the base-promoted activation of precatalyst 1 to
Palladium‐Catalyzed C−H Alkenylation of α‐Aryl Alkyl Nitriles
作者:Jingwen Wang、Zhonglin Tao
DOI:10.1002/cctc.202301730
日期:2024.7.8
The direct α-alkenylation of nitrile was realized with palladium catalyst for the first time. Both cyano group and alkenyl group in the product can be functionalized, rendering this method a powerful protocol to synthesis a series of useful compounds.