1.
Acta Crystallogr Sect E Struct Rep Online
; 65(Pt 10): o2572, 2009 Sep 30.
Artigo
em Inglês
| MEDLINE
| ID: mdl-21578009
RESUMO
Reaction of 2-(methyl-sulfan-yl)pyrimidin-4-amine with the 5-(methoxy-vinyl-idene) derivative of Meldrum's acid and subsequent heating of the product in Dowtherm fluid yielded the title compound, C(8)H(7)N(3)OS, which was proven to contain a bicyclic 4H-pyrimido[1,6-a]pyrimidine system. All non-H atoms of the mol-ecule are coplanar within 0.15â Å. The bond-length distribution in the bicyclic core shows localization of the double bonds. The geometry of the intra-molecular Sâ¯O 1,5-contact [2.534â (2)â Å] is consistent with the existence of an attractive inter-action.