Analogues of 10-Deazaaminopterin and 5-Alkyl-5,10-dideazaaminopterin with the 4-Substituted 1-Naphthoyl Group in the Place of 4-Substituted Benzoyl
作者:James R. Piper、Balakrishnan Ramamurthy、Cheryl A. Johnson、Glenys M. Otter、Francis M. Sirotnak
DOI:10.1021/jm9506940
日期:1996.1.1
10-Deaza modifications of classical antifolate analogues bearing the 1,4-disubstituted naphthalene ring in place of the 1,4-disubstituted benzene ring were prepared and tested for antitumor activity. Naphthalene analogues (9a-c, respectively) of 10-deazaaminopterin, 5-methyl-5,10-dideazaaminopterin, and 5-ethyl-5,10-dideazaaminopterin were prepared by a route consisting of C-alkylations of the anion derived from 4-carboxy-1-naphthaleneacetic acid dimethyl ester (2) by 6-(bromomethyl)-2,4-diaminopteridine (la) and 6-(bromomethyl)-2,4-diamino-5-methyl- and -5-ethyl-5-deazapteridines (Ib and Ic, respectively) followed by ester hydrolysis and subsequent decarboxylation to give naphthalene analogues (7a-c, respectively) of 4-amino-4-deoxy-10-deazapteroic acid and 4-amino-4-deoxy-5-methyl- and -5-ethyl-5,10-dideazapteroic acids. Peptide coupling of 7a-c with L-glutamic acid dialkyl ester followed by mild ester hydrolysis gave target compounds 9a-c. The key advantage of this route is circumvention of a hydrogenation step requiring selectivity as in earlier approaches involving 9,10-olefinic precursors. Steric limitations thwarted plans to prepare the naphthalene analogue of 10-ethyl-10-deazaaminopterin; attempted alkylations of 2-(4-carboxy-1-naphthyl)butyric acid dimethyl ester with la failed as did attempted further alkylation (by EtBr) of the product derived from la and 2. Growth inhibition tests against three tumor cell lines (L1210, S180, and HL60) showed 9a to be 4-6-fold more inhibitory than methotrexate but not as inhibitory as 10-ethyl-10-deazaaminopterin; 9b and 9c were no more inhibitory than MTX. In tests against the E0771 mammary adenocarcinoma in mice, 9a was less active than MTX.