Pg. Baraldi et al., A synthetic approach for the preparation of rigid analogs of 1,3-dipropyl-7-methyl-8-aryl/heteroarylstyryl xanthines, SYNTHESIS-S, (5), 2001, pp. 773-777
Tethering the N-8-substituents of N-8-substituted styryl xanthine to N-7 ha
s resulted in a series of conformationally constrained styryl xanthine anal
ogs having the general formula 8. These new compounds have also been evalua
ted in order to investigate ii the A(2A) adenosine receptor would be able t
o tolerate such a modification.