Selective α‐Monomethylation by an Amine‐Borane/
<i>N</i>
,
<i>N</i>
‐Dimethylformamide System as the Methyl Source
作者:Hui‐Min Xia、Feng‐Lian Zhang、Tian Ye、Yi‐Feng Wang
DOI:10.1002/anie.201804794
日期:2018.9.3
A new and practical α‐monomethylation strategy using an amine‐borane/N,N‐dimethylformamide (R3N‐BH3/DMF) system as the methyl source was developed. This protocol has been found to be effective in the α‐monomethylation of arylacetonitriles and arylacetamides. Mechanistic studies revealed that the formyl group of DMF delivered the carbon and one hydrogen atoms of the methyl group, and R3N‐BH3 donated
开发了一种新的实用的α-单甲基化策略,该方法使用胺-硼烷/ N,N-二甲基甲酰胺(R 3 N-BH 3 / DMF)系统作为甲基来源。已发现该方案对芳基乙腈和芳基乙酰胺的α-单甲基化有效。机理研究表明,DMF的甲酰基传递了碳原子和甲基的一个氢原子,而R 3 N-BH 3则贡献了其余的两个氢原子。如此独特的反应路径使得使用Me 2 NH-BH 3 / d可控制地组装CDH 2,CD 2 H和CD 3单元。7 ‐ DMF ,Me 3 N‐BD 3 / DMF和Me 3 N‐BD 3 / d 7 ‐ DMF系统。证实了该方法在抗炎药氟比洛芬及其各种氘标记衍生物的简便合成中的进一步应用。