One pot tandem dual CC and CO bond reductions in the β-alkylation of secondary alcohols with primary alcohols by ruthenium complexes of amido and picolyl functionalized N-heterocyclic carbenes
作者:A. P. Prakasham、Sabyasachi Ta、Shreyata Dey、Prasenjit Ghosh
DOI:10.1039/d1dt02849a
日期:——
investigation performed on two representative catalytic substrates, 1-phenylethanol and benzyl alcohol using the neutral ruthenium (1c) complex showed that the catalysis proceeded via a partially reduced CC hydrogenated carbonyl species, [PhCOCH2CH2Ph] (3′), to the fully reduced CO and CC hydrogenated secondary alcohol, [PhCH(OH)CH2CH2Ph] (3). Furthermore, the time dependent study showed that the major product
两种不同类别的钌配合物,即 [1-mesityl-3-(2,6-Me 2 - phenylacetamido)-imidazol -2- ylidene ]Ru( p- cymene)Cl ( 1c ) 和 [1-(pyridin -2-ylmethyl)-3-(2,6-Me 2 - phenyl)-imidazol -2- ylidene ]Ru( p- cymene)Cl}Cl ( 2c ), 成功催化了一锅串联醇-醇偶联反应的各种仲和伯醇的,在中度至良好的产率CA。63–89%。使用中性钌 ( 1c ) 配合物对两种代表性催化底物 1-苯基乙醇和苯甲醇进行的机理研究表明,催化是通过部分还原的 CC 氢化羰基物质 [PhCOCH 2 CH 2 Ph] ( 3' ),转化为完全还原的CO 和 C C 氢化仲醇 [PhCH(OH)CH 2 CH 2 Ph] ( 3 )。此外,时间依赖性研究表明,在120