BAY-41-4109
海湾41-4109外消旋 Chemical Name: (-)-4(R)-(2-Chloro-4-fluorophenyl)-2-(3,5-difluoropyridin-2-yl)-6-methyl-1,4-dihydropyrimidine-5-carboxylic acid methyl ester
CAS No. 298708-81-3, 298708-79-9 (undefined stereoch.)
项目整合开发状态: Preclinical
项目研究机构: Bayer (Originator)
合成路线:Preparation of 2-cyano-3,5-dichloropyridine (IV) has been reported by two alternative procedures:3,5-Dichloropyridine (I) was converted to the corresponding N-oxide (II) by treatment with peracetic acid.Addition of cyanotrimethylsilane in the presence of dimethylcarbamoyl chloride gave rise to the cyanopyridine (IV).In a different method,displacement of the 2-chloro group of 2,3,5-trichloropyridine (III) with cuprous cyanide in refluxing diglyme led to the target nitrile (IV).Displacement of both chloro groups of pyridine (IV) by KF in hot DMSO furnished the difluoropyridine (V).The cyano group of (V) was then converted to the key amidine (VII) by two related routes.Addition of hydroxylamine to nitrile (V) provided the hydroxyamidine (VI),which was further reduced to amidine (VII) by catalytic hydrogenation.Alternatively,nitrile (V) was directly converted to (VII) by treatment with ammonium chloride and trimethylaluminium.
合成路线:Knoevenagel condensation of 2-chloro-4-fluorobenzaldehyde (VIII) with methyl acetoacetate (IX) in the presence of piperidine acetate afforded the benzylidene compound (X).Cyclocondensation of (X) with amidine (VII) provided the racemic dihydropyrimidine (XI).Resolution of (XI) was accomplished either by chiral HPLC or via conversion to the diastereoisomeric salts with (-)-camphanic acid.
📌 参考资料/链接：
参考文献标题:Dihydropyrimidines and their use in the treatment of hepatitis B
文献作者:Paessens,A.; Stoltefuss,J.; Goldmann,S.; Niew鰄ner,U.; Kr鋗er,T.; Schlemmer,K.-H.; Weber,O.; Graef,E.; Lottmann,S.; St鰈ting,J.; Deres,K.(Bayer AG)
参考来源:WO 0058302
📄 详细内容
合成路线:Preparation of 2-cyano-3,5-dichloropyridine (IV) has been reported by two alternative procedures:3,5-Dichloropyridine (I) was converted to the corresponding N-oxide (II) by treatment with peracetic acid.Addition of cyanotrimethylsilane in the presence of dimethylcarbamoyl chloride gave rise to the cyanopyridine (IV).In a different method,displacement of the 2-chloro group of 2,3,5-trichloropyridine (III) with cuprous cyanide in refluxing diglyme led to the target nitrile (IV).Displacement of both chloro groups of pyridine (IV) by KF in hot DMSO furnished the difluoropyridine (V).The cyano group of (V) was then converted to the key amidine (VII) by two related routes.Addition of hydroxylamine to nitrile (V) provided the hydroxyamidine (VI),which was further reduced to amidine (VII) by catalytic hydrogenation.Alternatively,nitrile (V) was directly converted to (VII) by treatment with ammonium chloride and trimethylaluminium.
合成路线:Knoevenagel condensation of 2-chloro-4-fluorobenzaldehyde (VIII) with methyl acetoacetate (IX) in the presence of piperidine acetate afforded the benzylidene compound (X).Cyclocondensation of (X) with amidine (VII) provided the racemic dihydropyrimidine (XI).Resolution of (XI) was accomplished either by chiral HPLC or via conversion to the diastereoisomeric salts with (-)-camphanic acid.
参考文献标题:BAY 41-4109: A novel non-nucleosidic and highly potent inhibitor of human hepatitis B virus.Part 1: Synthesis and structure activity relationship (SAR)
文献作者:Goldmann,S.; et al.
参考来源:41st Intersci Conf Antimicrob Agents Chemother (Dec 16 2001,Chicago) 2001,Abst F-1664
产品链接: CAS No. 298708-81-3›› 产品链接: CAS No.298708-79-9››