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Abstract

Alkaline sensitive protaxol is water soluble and is hydrolyzed at physiological (alkaline) pH to render the native taxol structure and the native taxol activity. Protaxol compositions include 2'- and/or 7-O-ester derivatives of taxol and/or 2'- and/or 7-O-carbonate derivatives taxol. Protaxol has a formula as follows: ##STR1## wherein R.sup.1 and R.sup.2 are each H or a radical selected from the group consisting of --CO--(CH.sub.2).sub.m --X--(CH.sub.2).sub.n --COZ and --COO--(CH.sub.2).sub.o --Y--Ar, and wherein m, n, and o are each an integer of 1 to 3; X is O, S, NH, SO, or SO.sub.2 ; Y is S, SO or SO.sub.2 ; Ar is phenyl or substituted phenyl wherein the substituent is halo, amino, nitro or N,N-dialkylamino having 1 to 4 carbons in each of the alkyl groups; and Z is OH, OR.sup.3, SR.sup.3 or NR.sup.4 R.sup.5 wherein R.sup.3 is alkyl containing 1 to 4 carbons and R.sup.4 and R.sup.5 are each alkyl containing 1 to 4 carbons, or taken together with the nitrogen to which they are attached form a saturated heterocyclic ring having 4 or 5 carbons, with the proviso that at least one R.sup.1 and R.sup.2 is not hydrogen; as well as the salts of such compounds with organic/inorganic bases and acids, preferably pharmaceutically acceptable salts.

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First Claim