[Synthesis and pharmacologic examination of derivatives of benzoxazaphosphoryl-4-one and 2-phenyl-10-methyl-3a-triethoxyphosphone-1H,2,3,9,10-tetrahydropyrrolo [3,4-b][1,4]benzoxazepine-1,3,9-trione].

A series of N-derivatives of 2-phenyl-2,3-dihydro-1,3,2(lambda 5)- benzoxazaphosphoryl-4-one and 2-phenyl-10-methyl-3a-triethoxyphosphonio- 1H,2,3,9,10-tetrahydropyrrolo[3,4-b]([1,4]benzoxazepine-1,3,9-trio ne have been prepared. The pharmacological investigation of the above mentioned compounds shows antitumor action against leukaemia in the case of three N-derivatives.