合成路线:By condensation of the sodium salt of 1,3-dibutyl-xantine (I) with chloroacetone (II) in refluxing ethanol.
合成路线:The condensation of pyruvic aldehyde dimethyl acetal (I) with dimethylformamide dimethyl acetal (II) afforded ketoenamine (III),which was condensed with N-methyl guanidine (IV) to give pyrimidine (V).Acid hydrolysis of the acetal function of (V) yielded pyrimidine carboxaldehyde (VI),which was converted to the imine (VIII) by treatment with 1-Boc-4-aminopiperidine (VII).Isonitrile (XII) was prepared by condensation of 4-fluorobenzaldehyde (IX) with formamide and p-thiocresol (X),followed by dehydration of the resulting formamide (XI) by means of POCl3 and Et3N.Reaction of isonitrile (XII) with imine (VIII) in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) produced imidazole (XIII).Finally,acid deprotection of the Boc group of (XIII) provided the title compound.
合成路线:In a related procedure,condensation of 4-fluorobenzaldehyde (IX) with formamide and p-toluenesulfinic acid (XIV) produced the tosyl formamide (XV),which was dehydrated by means of POCl3 and Et3N to give isonitrile (XVI).Imidazole (XIII) was then obtained by reaction of this isonitrile with imine (VIII).Finally,the Boc protecting group of (XIII) was removed by acid treatment as above.
合成路线:Two related syntheses have been reported for this compound.The intermediate alpha-tosyl-(4-fluorobenzyl)isonitrile (V) was prepared by condensation of 4-fluorobenzaldehyde (I),p-toluenesulfinic acid (II) and formamide (III) in the presence of chlorotrimethylsilane (1-4),followed by dehydration of the resulting formamide derivative (IV) with POCl3 and triethylamine.
合成路线:In the original procedure,pyruvic aldehyde dimethyl acetal (VI) was condensed with N,N-dimethylformamide dimethyl acetal to give enaminoketone (VII).Subsequent reaction of (VII) with guanidine (VIII) provided 2-aminopyrimidine-4-carboxaldehyde dimethyl acetal (IX),which was hydrolyzed to the corresponding aldehyde (X) with 3 N HCl at 48 C.This was condensed with 4-amino-2,2,6,6-tetramethylpiperidine (XI) to produce imine (XII).Finally,reaction between imine (XII) and tosyl isonitrile (V) in the presence of K2CO3 generated the target imidazole.
合成路线:Condensation between p-fluorobenzaldehyde (I),p-toluenesulfinic acid (II) and formamide in the presence of camphorsulfonic acid afforded 4-fluorophenyltosylmethyl formamide (III).Subsequent dehydration of (III) by means of POCl3 and Et3N produced isonitrile (IV).Imine (VII) was prepared by condensation of pyridine-4-carboxaldehyde (V) with 1-Boc-4-aminopiperidine (VI) using MgSO4 as the dehydrating reagent.Dipolar cycloaddition of this imine with the anion of tosyl isonitrile (IV) generated the trisubstituted imidazole (VIII).Finally,acid cleavage of the Boc protecting group furnished the title compound.
参考文献标题:Certain 1,4,5-tri-substd.imidazole cpds.useful as cytokine
文献作者:Adams,J.L.; Gallagher,T.F.; Garigipati,R.S.; Boehm,J.C.; Sisko,J.; Peng,Z.-Q.; Lee,J.C.-L.(SmithKline Beecham plc)
参考来源:EP 0809499; JP 1998512555; US 5593992; WO 9621452
合成路线:By condensation of the sodium salt of 1,3-dibutyl-xantine (I) with chloroacetone (II) in refluxing ethanol.
参考文献标题:BRL-30892
文献作者:Castar,J.; Koch,H.
参考来源:Drugs Fut 1985,10(10),809
产品链接: CAS No. 57076-71-8››