From: Microwave assisted synthesis of bis and tris(ω-bromoacetophenones): versatile precursors for novel bis(imidazo[1,2-a]pyridines), bis(imidazo[1,2-a]pyrimidines) and their tris-analogs
Entry
X
Y
8a-e( o-isomer)
Yield%a
Δ
MW
1
2
CH
8a
78
81
3
8b
69
74
4
8c
72
89
N
8d
53
70
5
8e
63
83
9a-d( p- isomer)
6
9a
55
82
7
9b
65
87
8
9c
68
9
9d
64
86