| 摘要 |
A process for preparing 2-oxo-dihydrobenzo[d][1,3]oxazines (also named 1,4-dihydro-2H-3,1-benzoxazin-2-ones) which process comprises treating a suspension or solution of a 2-carbamoyl-benzyl alcohol in a substantially water-immiscible organic medium with aqueous alkaline hypochlorite or hypobromite having a pH of at least 11 in the presence of a phase transfer catalyst; and conversion of the 2-oxo-dihydrobenzo[d][1,3]oxazines to corresponding 2-amino-benzyl alcohols which are useful as intermediates in the production of dyes, pharmaceuticals and herbicides. |
