Synthesis and Antiviral Activity of (Z)- and (E)-2,2-[Bis(hydroxymethyl)cyclopropylidene]methylpurines and -pyrimidines: Second-Generation Methylenecyclopropane Analogues of Nucleosides
摘要:
The second generation of methylenecyclopropane analogues of nucleosides 5a-5i and 6a-6i was synthesized and evaluated for antiviral activity. The 2,2-bis(hydroxymethyl)methylenecyclopropane (11) was converted to dibromo derivative 7 via acetate 12. Alkylation-elimination of adenine (16) with 7 afforded the Z/E mixture of acetates 17 + 18, which was deacetylated to give analogues 5a and 6a separated by chromatography. A similar reaction with 2-amino-6-chloropurine (19) afforded acetates 20 + 21 and, after deprotection and separation, isomers 5f and 6f. The latter served as starting materials for synthesis of analogues 5b, 5e, 5g-5i and 6b, 6e, 6g-6i. Alkylation-elimination of N(4)-acetylcytosine (22) with 7 afforded a mixture of isomers 5c + 6c which were separated via N(4)-benzoyl derivatives 23 and 24. Deprotection furnished analogues 5c and 6c. Alkylation of 2,4-bis(trimethylsilyloxy)-5-methylpyrimidine (25) with 7 led to bromo derivative 26. Elimination of HBr followed by deacetylation and separation gave thymine analogues 5d and 6d. The guanine Z-isomer 5b was the most effective against human and murine cytomegalovirus (HCMV and MCMV) with EC(50) = 0.27-0.49 muM and no cytotoxicity. The 6-methoxy analogue 5g was also active (EC(50) = 2.0-3.5 muM) whereas adenine Z-isomer 5a was less potent (EC(50) = 3.6-11.7 muM). Cytosine analogue 5c was moderately effective, but 2-amino-6-cyclopropylamino derivative 5e was inactive. All E-isomers were devoid of anti-CMV activity, and none of the analogues was significantly active against herpes simplex viruses (HSV-1 or HSV-2). The potency against Epstein-Barr virus (EBV) was assay-dependent. In Daudi cells, the E-isomers of 2-amino-6-cyclopropylamino- and 2,6-diaminopurine derivatives 6e and 6h were the most potent (EC(50) approximate to 0.3 muM), whereas only the thymine Z-isomer 5d was active (EC(50) = 4.6 muM). Guanine Z-derivative 5b was the most effective compound in H-1 cells (EC(50) = 7 muM). In the Z-series, the 2-amino-6-methoxypurine analogue 5g was the most effective against varicella zoster virus (VZV, EC(50) = 3.3 muM) and 2,6-diaminopurine 5h against hepatitis B virus (HBV, EC(50) = 4 muM). Adenine analogues 5a and 6a were moderately active as substrates for adenosine deaminase.
Nucleotides and Pronucleotides of 2,2-Bis(hydroxymethyl)methylenecyclopropane Analogues of Purine Nucleosides: Synthesis and Antiviral Activity
摘要:
Phenylmethylphosphor-L-alaninate pronucleotides 7a, 7b, 8a, and 8b, cyclic phosphates 10a and 10b, and phosphates 11a and 11b derived from 2,2-bis(hydroxymethyl)methylenecyclopropane analogues 1a, 1b, 2a, and 2b were synthesized and evaluated for their antiviral activity. An improved protocol for the synthesis of analogues 1a, 1b, 2a, and 2b is also described. Phosphate 11a was the most effective agent against human and murine cytomegalovirus (EC50 0.25-1.1 muM). The Z-pronucleotides 7a and 7b had EC50 3.6-25.2 and 3-18.4 muM, respectively. The EC50 of cyclic phosphate 10a was 6.0-20 muM. The activity against Epstein-Barr (EBV) was assay-dependent. Pronucleotides 7a and 7b and phosphate 11a had EC50 2.3-3.4 muM against EBV/H-1, but 7b was cytotoxic (CC50 3.8 muM). Cyclic phosphate 10a was the only compound effective against EBV/Daudi (EC50 0.96 muM). but it was inactive in H-1 cells. Pronucleotide 7a was active against varicella zoster virus with EC50 6.3 and 7.3 muM, respectively. and hepatitis B virus (HBV, EC50 4.1 muM). Cyclic phosphate 10a was the most effective analogue against HBV (EC50 0.8 muM).
with cyanoaokenes substituted with ester groups catalyzed by a Sn and Mg ate complex. The diastereoselectivity was affected by the halogen of the catalyst and electron‐withdrawing groups on the cyanoalkene. The transformation of the spirohexane was carried out to afford a cyclopentanoid which has been prepared only by a transition metal catalyst.
Novel transformation of methylenecyclopropanes (MCPs) with acyl cyanoalkenes has been achieved to give oxaspiro[2.5]octenes. This annulation is successfully catalyzed by magnesium halides under mild reaction conditions, and shows a broad functional group tolerance. The reaction includes a rare reaction course, which involves an intramolecular oxa-Michael addition of Mg enolate after the ring opening
C−H/C−C functionalizations with methylenecyclopropanes (MCPs) were accomplished with a versatile base‐metal catalyst. A robust manganese(I) complex enabled the expedient annulation of MCPs by synthetically meaningful ketimines to deliver, upon one‐pot hydroarylation, densely substituted polycylic anilines in a step‐economical fashion. Mechanistic studies provided strong support for a facile organometallic
使用亚甲基环丙烷(MCP)进行C / H / C-C官能化反应是通过通用的贱金属催化剂完成的。强大的锰(I)配合物通过合成意义上的酮亚胺使MCP的便捷脱环成为可能,从而在一步锅加氢芳基化反应中以分步经济的方式提供了稠密取代的多环苯胺。机理研究为简便的有机金属CH锰提供了有力的支持,而典型的钴,钌,铑和钯催化剂被发现完全无效。
2,2-bis-(hydroxymethyl)cyclopropylidenemethyl-purines and pyrmindines as antiviral agents
申请人:Zemlicka Jiri
公开号:US20050113393A1
公开(公告)日:2005-05-26
Compounds which are active against viruses have the following formulas:
wherein B is a purine or pyrimidine heterocyclic ring or base. In a preferred embodiment, the purine include 6-aminopurine (adenine), 6-hydroxypurine (hypoxanthine), 2-amino-6-hydroxypurine (guanine), 2,6-diamino-purine, 2-amino-6-azidopurine, 2-amino-6-halo substituted purines such as 2-amino-6-chloropurine, 2-amino-6-fluoropurine, 2-amino-6-alkoxypurines such as 2-amino-6-methoxypurine, 2-amino-6-cyclopropylaminopurine, 2-amino-6-alkylamino or 2-amino-6-dialkylamino substituted purines, 2-amino-6-thiopurine, 2-amino-6-alkylthio substituted purines, 3-deazapurines, 7-deazapurines and 8-azapurines. The pyrimidine incorporates cytosine, uracil and thymine, 5-halo substituted cytosines and uracils, 5-alkyl substituted cytosines and uracils including derivatives with a saturated or unsaturated alkyl group and 6-azapyrimidines.
2,2-Bis-(hydroxymethyl)cyclopropylidenemethyl-Purines and -Pyrimidines As Antiviral Agents
申请人:Zemlicka Jiri
公开号:US20090118308A1
公开(公告)日:2009-05-07
Compounds which are active against viruses have the following formulas:
wherein B is a purine or pyrimidine heterocyclic ring or base. In a preferred embodiment, the purine include 6-aminopurine (adenine), 6-hydroxypurine (hypoxanthine), 2-amino-6-hydroxypurine (guanine), 2,6-diamino-purine, 2-amino-6-azidopurine, 2-amino-6-halo substituted purines such as 2-amino-6-chloropurine, 2-amino-6-fluoropurine, 2-amino-6-alkoxypurines such as 2-amino-6-methoxypurine, 2-amino-6-cyclopropylaminopurine, 2-amino-6-alkylamino or 2-amino-6-dialkylamino substituted purines, 2-amino-6-thiopurine, 2-amino-6-alkylthio substituted purines, 3-deazapurines, 7-deazapurines and 8-azapurines. The pyrimidine incorporates cytosine, uracil and thymine, 5-halo substituted cytosines and uracils, 5-alkyl substituted cytosines and uracils including derivatives with a saturated or unsaturated alkyl group and 6-azapyrimidines.