ANTITUMOR BENZOXAZINE DERIVATIVES HAVING INHIBITORY ACTIVITY AGAINST HISTONE DEACETYLASE AND PREPARATION METHOD THEREOF

摘要

PURPOSE: Benzoxazine derivatives and a preparation method thereof are provided, which compounds have inhibitory activity against histone deacetylase which removes an acetyl group from the lysine tail in the N-terminal of histone to selectively induce the terminal differentiation of the tumor cells, so that the compounds can effectively inhibit growth of tumor cells. CONSTITUTION: The benzoxazine derivatives represented by formula (1) are provided, wherein R1 is aryl, heteroaryl or C3-C8 cycloaryl which is optionally substituted with one or more substituents selected from hydroxy, halogen, alkyloxy, alkyl, amino, alkylamino, carboxyl, nitro, amide and sulfone in which the heteroaryl contains one or more elements selected from nitrogen, sulfur and oxygen in a ring; R2 is hydrogen or arylalkyl; A is O, S, CH2, sulfone(SO2), sulfoxide(SO), CONH, NHCO, NX or NXSO2 in which X is hydrogen, C1-5 alkyl or independently the same as R1; and n is 0, 1, 2 or 3. The method for preparing compounds of formula (2) comprises the steps of: (a) acylation reacting 2-bromo arylalkyl carboxylic acid of formula (6) with hydroxyamino benzoic ester of formula (7) in aprotic solvent to prepare compounds of formula (8); (b) cyclization of the compounds of formula (8) in the presence of inorganic salt to prepare benzoxazine ester of formula (9); (c) treating the benzoxazine ester of formula (9) with hydroxide salt to prepare an organic acid of formula (10); (d) acylation reacting the organic acid of formula (10) with the protected hydroxyl amine in aprotic solvent to prepare compounds of formula (11); and (e) hydrogenating the compounds of formula (11) in the presence of palladium, wherein Y is O, S, CH2, SO2, SO or NX.