Research Article: 2-Methyl-4-oxo-6,7,8,9-tetrahydro­thieno[2′,3′:4,5]pyrimidino­[1,2-a]pyridine-3-carboxylic acid

Date Published: April 01, 2011

Publisher: International Union of Crystallography

Author(s): Burkhon Zh. Elmuradov, Khurshed A. Bozorov, Rasul Ya. Okmanov, Bakhodir Tashkhodjaev, Khusnutdin M. Shakhidoyatov.


There are two independent mol­ecules in the asymmetric unit of the title compound, C12H12N2O3S. With the exception of the methyl­ene groups, a mean plane fitted through all non-H atoms of each mol­ecule has an r.m.s. deviation of 0.035 Å for one mol­ecule and 0.120 Å for the second. In one of the independent mol­ecules, the methyl­ene groups was refined using a disorder model with an occupancy ratio of 0.53:0.47 (14). Each molecule features an intra­molecular O—H⋯O hydrogen bond, which generates an S(7) ring.

Partial Text

For the synthesis of thieno[2,3-d]pyrimidin-4-ones and their derivatives, see: Litvinov (2004 ▶); Elmuradov et al. (2010 ▶); Csukonyi et al. (1986 ▶). For the physiological activity of thieno[2,3-d]pyrimidin-4-ones and their derivatives, see: Lilienkampf et al. (2007 ▶). For a related structure, see: Bozorov et al. (2010 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).




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