(.+-.)-N9-(2-(Hydroxymethyl)spiro[3.3]hept-6-yl)adenine. The First Biologically Active Saturated Analog of Adenallene with Axial Dissymmetry
作者:Bryan C. N. M. Jones、John C. Drach、Thomas H. Corbett、David Kessel、Jiri Zemlicka
DOI:10.1021/jo00125a011
日期:1995.10
Synthesis of the title analogue 2 is described. Fecht's acid (3) was esterified with N,N-dimethylformamide dimethyl acetal to give monoester 4 along with diester 5. Compound 4 was transformed to ester amide 6 by the reaction with isobutyl chloroformate and triethylamine followed by ammonolysis. Hoffman rearrangement of 6 effected by lead tetraacetate in tert-butyl alcohol led to the N-tert-butoxycarbonyl ester 7. The latter was reduced with Ca(BH4)(2) to give the protected amino alcohol 8. Removal of the N-tert-butoxycarbonyl group with 2 M HCl in methanol afforded the hydrochloride of amino alcohol 9. Reaction of 9 with 5-amino-4,6-dichloropyrimidine and triethylamine gave the pyrimidine derivative 10 which, in turn, was cyclized to 6-chloropurine 11a. Ammonolysis of the latter intermediate afforded the title analogue 2. The H-1 NMR spectrum of Fecht's acid (3) in CD3COCD3 showed that four methylene protons were magnetically nonequivalent (two quartets) whereas the other four were equivalent, forming a single doublet. Compound 2 inhibited the replication of human cytomegalovirus (IC50 32 mu M) and growth of murine leukemia L1210 cells (IC50 30 mu M). Zone assays showed inhibition of the following tumor cultures at 0.5 mg/disk: murine leukemia P388, mouse tumors PO3, C38, and M17/Adr as well as human tumors MCF-7 and CX-1..