2-Aminopyridine → 4-Tert-butyl-phenyl-imidazo[1,2-a]pyridine

반응식

[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[N:12]=[C:13]3[CH:18]=[CH:17][CH:16]=[C:15](N4CCNCC4)[N:14]3[CH:25]=2)=[CH:7][CH:6]=1)([CH3:4])([CH3:3])[CH3:2].NC1C=CC=CN=1.C(C1C=CC(C(=O)CCl)=CC=1)(C)(C)C>>[C:1]([C:5]1[CH:10]=[CH:9][C:8]([C:11]2[N:12]=[C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][N:14]3[CH:25]=2)=[CH:7][CH:6]=1)([CH3:4])([CH3:2])[CH3:3]

참가 물질

반응물 3

HCID 104392-Aminopyridine

HCID 2296611-(4-Tert-butylphenyl)-2-chloroethan-1-one

HCID 57832787HCID 57832787, 화합물

생성물 1

HCID 578327904-Tert-butyl-phenyl-imidazo[1,2-a]pyridine

실험 절차

Scheme 4 provides the synthesis of a specific intermediate following the general procedures set forth in Scheme 3, which can be further elaborated to provide compounds of the Formula (IB). 2-(4-tert-Butyl-phenyl)-5-piperazin-1-yl-imidazo[1,2-a]pyridine (7) was obtained as described in Scheme 4. 2-Aminopyridine was cyclized with 4-tert-butylphenacyl chloride to afford 2-(4-tert-butyl-phenyl-imidazo[1,2-a]pyridine (5). Lithiation followed by bromination provided a ratio of three products (6a, 70.7%; 6b, 12.3%; and 6c, 17.0%). Heating the mixture with piperazine provided (7) from (6a), which was easily separated from unreactive (6b) and (6c).