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Mark C. Elliott David E. Hibbs David S. Hughes Michael B. Hursthouse Elbertus Kruiswijk K. M. Abdul Malik 《Journal of chemical crystallography》1998,28(9):663-671
Three novel dihydropyrimidine compounds N8,6-di(4-nitrophenyl)-(3R)-ethyl-(7R)-methyl-5-oxo-2,3,6,7-tetrahydrooxazolo[3,2,c] pyrimidine-8-carboxamide (2), N8,6-di((4-methylphenyl)-sulfonyl)-(3R)-ethyl-5-oxo-(7R)-phenyl-2,3,6,7-tetrahydrooxazolo [3,2,c]pyrimidine-8-carboxamide (3) and N8,6-di ((4-methylphenyl)sulfonyl)-(3R)-ethyl-(7R)-methyl-5-oxo-2,3,6,7-tetrahydrooxazolo[3,2,c] pyrimidine-8-carboxamide (4) have been prepared (from 2-amino-1-butanol of 64.4% e.e.) and structurally characterized by X-ray crystallography. All three compounds contain stereogenic centers, but the crystal of (2) chosen was found to be racemic whilst those of (3) and (4) were found to be homochiral. Compound (2) crystallizes in the monoclinic space group P21/c, with a = 17.958(4), b = 12.431(2), c = 9.653(2) Å, = 96.20(3)°, U = 2142.3(7) Å3, Z = 4, and D
c = 1.449 g cm–3. Compounds (3) and (4) both crystallize in the monoclinic space group P21, with a = 9.349(2), b = 5.824(5), c = 26.513(8) Å, = 99.43(2)°, U = 1424.1(13) Å3, Z = 2 and D
c = 1.389 g cm–3 for (3), and a = 5.9526(9), b = 16.3521(10), c = 13.2263(11) Å, = 92.81(12)°, U = 1285.9(2) Å3, Z = 2 and D
c = 1.378 g cm–3 for (4). 相似文献
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