Three sterically hindered 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4H-pyran-3-carboxylate derivatives.
Three sterically hindered 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4H-pyran-3-carboxylate derivatives.
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三种空间位阻的 6-氨基-5-氰基-2-甲基-4-(1-萘基)-4H-吡喃-3-羧酸酯衍生物。
DOI:
10.1107/s0108270107049001
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发表时间:
2007
期刊:
影响因子:
--
通讯作者:
Hastings,LucasF
中科院分区:
文献类型:
--
作者:
Nesterov,VladimirN;Wiedenfeld,DavidJ;Nesterova,SvitlanaV;Hastings,LucasF
In the title compounds, 2-methoxyethyl 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4H-pyran-3-carboxylate, C21H20N2O4, (II), isopropyl 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4H-pyran-3-carboxylate, C21H20N2O3, (III), and ethyl 6-amino-5-cyano-2-methyl-4-(1-naphthyl)-4H-pyran-3-carboxylate, C20H18N2O3, (IV), the heterocyclic pyran ring adopts a flattened boat conformation. In (II) and (III), the carbonyl group and a double bond of the heterocyclic ring are mutually anti, but in (IV) they are mutually syn. The ester O atoms in (II) and (III) and the carbonyl O atom in (IV) participate in intramolecular C—H⋯O contacts to form six-membered rings. The dihedral angles between the naphthalene substituent and the closest four atoms of the heterocyclic ring are 73.3 (1), 71.0 (1) and 74.3 (1)° for (II)–(IV), respectively. In all three structures, only one H atom of the NH2 group takes part in N—H⋯O [in (II) and (III)] or N—H⋯N [in (IV)] intermolecular hydrogen bonds, and chains [in (II) and (III)] or dimers [in (IV)] are formed. In (II), weak intermolecular C—H⋯O and C—H⋯N hydrogen bonds, and in (III) intermolecular C—H⋯O hydrogen bonds link the chains into ladders along the a axis.
影响因子:
0.7
作者:
V. Nesterov;L. Kuleshova;M. Y. Antipin
通讯作者:
M. Y. Antipin
影响因子:
0.7
作者:
V. N. Nesterov;L. Kuleshova;M. Y. Antipin
通讯作者:
M. Y. Antipin
影响因子:
0.8
作者:
V. Nesterov;David J. Wiedenfeld;S. Nesterova;L. Daniels
通讯作者:
L. Daniels