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
14,b( o-isomer)
Yield%a
1
2
14a
58
4
14b
60
15-d( p -isomer)
3
15a
78
15b
81