accurate control of the reaction parameters realized within microreactor systems allowed for a taming of the reactivity of thermally unstable intermediates such as haloalkyllithiums. The first example of effective externaltrapping of a reactive carbenoid such as the chloromethyllithium is described. By using microreactor systems, a continuous flow synthesis of chloro alcohols and chloro amines could be
Organomagnesium Based Flash Chemistry: Continuous Flow Generation and Utilization of Halomethylmagnesium Intermediates
作者:Timo von Keutz、David Cantillo、C. Oliver Kappe
DOI:10.1021/acs.orglett.0c02725
日期:2020.10.2
The generation of highly unstable chloromethylmagnesium chloride in a continuous flow reactor and its reaction with aldehydes and ketones is reported. With this strategy, chlorohydrins and epoxides were synthesized within a total residence time of only 2.6 s. The outcome of the reaction can be tuned by simply using either a basic or an acidic quench. Very good to excellent isolated yields, up to 97%, have been obtained for most cases (30 examples).
SATO, MAKOTO;KOSASAYAMA, AKIRA;UCHIMARU, FUMIHIKO, CHEM. AND PHARM. BULL., 1981, 29, N 10, 2885-2892