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The crystal structure of the title compound (C 8 H 11 N 4 Br,  Mw  = 218.9) has been determined in order to elucidate the relative position of the substituents in the pyrimidine ring and better know the geometry of the molecule. Crystals are trigonal, space group  R 3 c  with  a  =  b  =  c  = 11.876(4) Å,  α  =  β  =  γ  = 101.95(3)°,  V  = 1547.5(9) Å 3 ,  Z  = 6, [lattice constants referred to the corresponding hexagonal unit cell are the following:  a  =  b  = 18.452(7),  c  = 15.745(15) Å,  α  =  β  = 90,  γ  = 120°,  V  = 4642(5) Å 3 ,  Z  = 18],  D  = 1.56 Mg · m −3 ,  λ (Mo Kα ) = 0.71069 Å,  μ  = 0.38 mm −1 ,  F (000) = 732,  T  = 293° K. The final  R  is 0.049 for 590 observed reflections. This structure determination confirms the position of the bromine atom bonded to the carbon between the heteroatoms.

4-Amino-2-bromo-6-methyl-5,6,7,8-tetrahydropyrido[2,3- d ]-pyrimidine