Iridium(I)-Catalyzed C–C and C–N Bond Formation Reactions via the Borrowing Hydrogen Strategy
作者:Sertaç Genç、Burcu Arslan、Süleyman Gülcemal、Salih Günnaz、Bekir Çetinkaya、Derya Gülcemal
DOI:10.1021/acs.joc.9b00632
日期:2019.5.17
Iridium(I) complexes having an imidazol-2-ylidene ligand with benzylic wingtips efficiently catalyzed the β-alkylation of secondary alcohols with primary alcohols and acceptorless dehydrogenative cyclization of 2-aminobenzyl alcohol with ketones through a borrowing hydrogen pathway. The β-alkylated alcohols, including cholesterol derivatives, and substituted quinolines were obtained in good yields
具有咪唑-2-亚甲基配体和苄基翼尖的铱(I)配合物可有效地催化仲醇与伯醇的β-烷基化,并通过借用的氢途径通过酮将2-氨基苄醇与酮进行无接受的脱氢环化反应。通过在空气气氛下使用微量的催化剂和催化量的NaOH或KOH,以高收率获得包括胆固醇衍生物在内的β-烷基化醇和取代的喹啉,并释放出水(和H 2)。(在喹啉合成的情况下)作为唯一的副产物。值得注意的是,该系统显示了94万的转换数(通过使用低至0.0001 mol%= 1 ppm的催化剂使仲醇与伯醇的β-烷基化)和9200(2-氨基苄醇与酮的无受体脱氢环化反应)。