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. Author manuscript; available in PMC: 2024 Jan 17.
Published in final edited form as: J Med Chem. 2002 Aug 1;45(16):3440–3450. doi: 10.1021/jm011093d

Table 4.

Solubilities of Imidazo[2,1-i]purin-5-one Derivatives in Comparison with Xanthines1

graphic file with name nihms-1958395-t0006.jpg
compd R1 R2 water solubility (μM)a
Xanthines
theophylline H H 44 400b,37
8-phenyltheophylline H phenyl 1038
8-styryltheophylline H styryl 0.22
caffeine methyl H 108 000b,37
8-phenylcaffeine methyl phenyl 487
8-styrylcaffeine methyl styryl 2.8
Imidazopurinonesc
17 methyl H 1 210 000
22 methyl phenyl 1450
a

At 20 °C unless otherwise noted.

b

At 25 °C.

c

Hydrochlorides.