Salts of oxazaphosphorine derivatives

Abstract

There are provided new antitumor salts of oxazaphosphorine derivatives of the formula ##STR1## where R.sub.1, R.sub.2, and R.sub.3 are the same or different and represent hydrogen, methyl, ethyl, 2-chloroethyl, or 2-methanesulfonyloxyethyl and wherein at least two of these residues are 2-chloroethyl and/or 2-methanesulfonyl-oxyethyl and A is the group --S--alk--SO.sub.3 H or --N(OH)--CONH--alk--CO.sub.2 H and alk represents a C.sub.2 -C.sub.6 -alkylene residue optionally containing a mercapto group, whereby alk also can be --CH.sub.2 -- in case there is a carboxy group attached to the alk group, with homocysteinethiolactone or .alpha.-amino-.epsilon.-caprolactam or a basic compound of the formula: ##STR2## wherein R.sub.4 is a hydroxy group, an amino group or a C.sub.1 -C.sub.6 -alkoxy group, R.sub.5 is hydrogen or a difluoromethyl group, R.sub.6 is hydrogen, an indolyl-(3)-methyl residue, imidazolyl-(4)-methyl residue, a C.sub.1 -C.sub.10 -alkyl group or a C.sub.1 -C.sub.10 -alkyl group which is substituted by a hydroxy group, a C.sub.1 -C.sub.6 -alkoxy group, a mercapto group, a C.sub.1 -C.sub.6 -alkylmercapto group, a phenyl group, a hydroxy phenyl group, an amino-C.sub.1 -C.sub.6 -alkylmercapto group, an amino-C.sub.1 -C.sub.6 -alkoxy group, an amino group, an aminocarbonyl group, a ureido group (H.sub.2 NCONH--), a guanidino group or a C.sub.1 -C.sub.6 -alkoxycarbonyl group, or wherein R.sub.6 together with the structured portion >CR.sub.5 (NR.sub.7 R.sub.8) forms the proline residue, the 4-hydroxy-proline residue or the 2-oxo-3-amino-3-difluoromethyl-piperidine and the residues R.sub.7 and R.sub.8 represent hydrogen or C.sub.1 -C.sub.6 -alkyl residues.