A General Catalytic Method for Highly Cost‐ and Atom‐Efficient Nucleophilic Substitutions
作者:Peter H. Huy、Isabel Filbrich
DOI:10.1002/chem.201800588
日期:2018.5.23
A general formamide‐catalyzed protocol for the efficient transformation of alcohols into alkyl chlorides, which is promoted by substoichiometric amounts (down to 34 mol %) of inexpensive trichlorotriazine (TCT), is introduced. This is the first example of a TCT‐mediated dihydroxychlorination of an OH‐containing substrate (e.g., alcohols and carboxylic acids) in which all three chlorine atoms of TCT
介绍了一种一般的甲酰胺催化方案,用于将醇有效转化为烷基氯,这是通过亚化学计量的量(低至34 mol%)的廉价三氯三嗪(TCT)促进的。这是TCT介导的含OH底物(例如,醇和羧酸)的二羟基氯化的第一个例子,其中TCT的所有三个氯原子都转移到了起始原料中。因此,增强的原子经济性可显着改善废物平衡(电子因子低至4),成本效率和可扩展性(> 50 g)。此外,当前的程序以高水平的官能团相容性和立体选择性为特色,因为仅释放弱酸性氰尿酸作为排他性副产物。最后,一锅法制备胺N 2反演,证明了所提出方法的高实用价值。