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: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 of pyruvic aldehyde dimethyl acetal (I) with dimethylformamide dimehylacetal provided ketoenamine (II).This was cyclized with guanidine to afford aminopyrimidine (III).Then,hydrolysis of the dimethyl acetal of (III) with 3 M HCl yielded aldehyde (IV).4-Fluorobenzaldehyde (V) was condensed with thiocresol (VI) and formamide in refluxing toluene to give 4-fluorophenyl-tolylthiomethyl formamide (VII),which was dehydrated to isocyanide (VIII) with POCl3 and Et3N at -30 C.Finally,imine (X),(obtained from pyrimidine aldehyde (IV) and 4-(3-aminopropyl)morpholine (IX)),was condensed with isocyanide (VIII) in the presence of 1,5,7-triazabicyclo[4.4.0]dec-5-ene to furnish the title 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:Pyridyl imidazole cpds.and compsns.
文献作者:Garigipati,R.S.; Adams,J.L.; Boehm,J.C.(SmithKline Beecham Corp.)
参考来源:US 5670527
产品链接: CAS No. 180869-32-3››