The disclosure herein relates to a new process for the preparation of 3-dihaloacetyl (un)substituted oxazolidine compounds by the catalytic hydrogenation of nitroalcohols with aldehydes or ketones followed by reaction with a dihaloacetyl halide as shown below
wherein
The R and R₁₋₅ groups are independently H, C₁₋₆ alkyl, haloalkyl, alkylol or alkoxy or alkoxyalkyl having up to 8 carbon atoms, phenyl, benzyl or heterocyclyl having up to 10 carbon atoms and containing O, S and/or N ring atoms and
X and X₁ are independently halogen, preferably chlorine, bromine or iodine, especially chlorine.
本公开涉及一种制备 3-二卤乙酰基(未)取代
噁唑烷化合物的新工艺,其方法是硝基醇与醛或酮催化加氢,然后与二卤乙
酰卤反应,如下所示
其中
R和R₁₋₅基团独立地为H、具有最多8个碳原子的C₁₋₆烷基、卤代烷基、烷醇或烷氧基或烷氧基烷基、具有最多10个碳原子并含有O、S和/或N环原子的苯基、苄基或杂环基,以及
X 和 X₁ 独立地是卤素,最好是
氯、
溴或
碘,尤其是
氯。