rac-Dimethyl 2-(tert-butylamino)-5-oxo-4,5-dihydropyrano[3,2-c]chromene-3,4-dicarboxylate
نویسندگان
چکیده
منابع مشابه
rac-Dimethyl 2-(tert-butylamino)-5-oxo-4,5-dihydropyrano[3,2-c]chromene-3,4-dicarboxylate
The title compound, C(20)H(21)NO(7), is asymmetric with a chiral centre located in the pyran ring and crystallizes as a racemate. The mol-ecular framework is somewhat bent; the coumarin moiety and the pyran ring are inclined by 7.85 (5)°. The mol-ecular structure is characterized by an intra-molecular N-H⋯O hydrogen bond, which generates an S(6) ring motif, and the crystal packing is stabilized...
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The title compound, C(24)H(29)NO(7), is asymmetric with a chiral centre located in the pyran ring and crystallizes as a racemate. The coumarin ring system and the fused pyran ring make a dihedral angle of 10.46 (8)°. A short intra-molecular N-H⋯O hydrogen bond between the amino group and the vicinal carbonyl group generates an S(6) ring. Inter-molecular C-H⋯O inter-actions contribute to the sta...
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In the crystal of the title compound, C(12)H(8)N(2)O(4)S, mol-ecules are linked into chains by a series of inter-molecular O-H⋯O, N-H⋯O and N-H⋯N hydrogen bonds. The ninhydrin and amino-thia-zolidine units make a dihedral angle of 66.41 (3)°. The crystal structure indicates the presence of equimolar R and S enanti-omers in the crystal lattice, due to the presence of a chiral centre in the title...
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The title compound, C(10)H(15)NO(4), also known as N-tert-butyl-oxycarbonyl-allohydr-oxy-l-proline lactone, is quite similar to N-acetyl-allohydr-oxy-l-proline lactone [Lenstra, Petit & Geise (1979 ▶). Cryst. Struct. Commun. 8, 1023-1029], whereby both carbonyl groups point roughly in the same direction because of the trans conformation of the peptide bond.
متن کاملrac-Ethyl 4-hydroxy-6-(2-hydroxyphenyl)-2-oxo-4-(trifluoromethyl)perhydropyrimidine-5-carboxylate
In the title compound, C(14)H(15)F(3)N(2)O(5), prepared by reaction of 2-hy-droxy-benzaldehyde, ethyl 4,4,4-trifluoro-3-oxobutano-ate and urea, the tetra-pyrimidine ring adopts a half-chair conformation. The crystal structure is stabilized by five inter-molecular hydrogen bonds, three O-H⋯O and two N-H⋯O, giving cyclic dimers (through three hydrogen bonds) which are further extended into a two-...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section E Structure Reports Online
سال: 2011
ISSN: 1600-5368
DOI: 10.1107/s1600536811041493