Nickel-Catalyzed Hydrogen-Borrowing Strategy for α-Alkylation of Ketones with Alcohols: A New Route to Branched <i>gem</i>-Bis(alkyl) Ketones
作者:Jagadish Das、Khushboo Singh、Mari Vellakkaran、Debasis Banerjee
DOI:10.1021/acs.orglett.8b02256
日期:2018.9.21
The α-alkylation of ketones using an earth-abundant and nonprecious NiBr2/L1 system is reported. This nickel-catalyzed reaction could be performed in gram scale and successfully applied in the synthesis of donepezil (Alzheimer’s drug) and functionalization of steroid hormones and fatty acid derivatives. Synthesis of N-heterocycles, methylation of ketones, and one-pot double alkylation to bis-hetero
据报道,使用一种地球上丰富的非贵重的NiBr 2 / L1系统对酮进行α-烷基化。该镍催化的反应可以以克为单位进行,并成功地用于多奈哌齐的合成(阿尔茨海默氏病药物)以及类固醇激素和脂肪酸衍生物的功能化。N-杂环的合成,酮的甲基化以及使用两种不同的醇和单一催化剂将一锅双烷基化为双-杂芳基酮,拓宽了催化规程的范围。使用定义的Ni-H物种和氘标记实验的初步机理研究确定了借用氢策略的参与。