Phthalidylammonium compounds and their production, and their use in the production of 1-phthalidyl-5-fluorouracil derivatives and formulations containing such derivatives
申请人:SHIONOGI & CO., LTD.
公开号:EP0112067A2
公开(公告)日:1984-06-27
Novel phthalidylammonium compounds (IV) are intermediates in a highly selective and high yield process for producing 1-phthalidyl-5-fluorouracil derivatives of formula (I) which are antitumour agents. The process comprises reacting a phthalidyl compound (II) with an amine (III) to yield the quaternary ammonium salts (IV), and then reacting the latter with 5-fluorouracil as follows:
in which X is a leaving group; R1, R2 and R3 each independently represents alkyl or R' represents alkyl and R2 and R3 taken together with the adjacent nitrogen atom form a saturated 5- or 6-membered ring which may contain oxygen or
represents quinuclidine; and R4 and R5 each independently represents hydrogen, trialkylsilyloxy, alkoxy, nitro, cyano, carboxy or alkoxycarbonyl.
Several 5-fluorouracil derivatives in which the phthalidyl (1, 3-dihydro-3-oxoisobenzofuran-1-yl) group, appropriately substituted on its benzene ring, is substituted at the N (1)-or N (3)-position or at both positions were synthesized, and their antitumor activities were evaluated. Among these compounds, 1-(1, 3-dihydro-3-oxoisobenzofuran-1-yl)-5-fluorouracil (3a, 590-S) was shown to be markedly active against several experimental tumor systems. Several methods for a simple and efficient large-scale preparation of 3a were examined. The large-scale preparation of 3a was effected most efficiently by the condensation of 5-fluorouracil with the quaternary ammonium salt of 3-bromophthalide in the presence of a base. The synthesis of (+)- and (-)-3a is also described.