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:
Acta crystallographica. Section C, Crystal structure communications
影响因子:
--
通讯作者:
Hastings,LucasF
Hastings,LucasF
中科院分区:
--
文献类型:
--
作者:
Nesterov,VladimirN;Wiedenfeld,DavidJ;Nesterova,SvitlanaV;Hastings,LucasF

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在标题化合物中,2-甲氧基乙基-6-氨基-5-氰基-2-甲基-4-(三氟甲基)苯甲酰胺(2-methoxyethyl 6-amino-5-cyano-2-methyl-4-cyano-2-methyl(1-萘基)-4H-吡喃-3-甲酸异丙酯,C21 H20 N2 O 4,(II),6-氨基-5-氰基-2-甲基-4-(1-萘基)-4H-吡喃-3-甲酸乙酯,C21 H20 N2 O3,(III),和6-氨基-5-氰基-2-甲基-4-甲基-N-(2-(2-(三氟甲基)苯基)氨基)-4-(三氟甲基)苯甲酸乙酯,(1-萘基)-4H-吡喃-3-羧酸酯,C20 H18 N2 O3,(IV),杂环吡喃环采用扁平的船形构象。在(II)和(III)中,羰基和杂环的双键是相互反的,但在(IV)中它们是相互顺的。(II)和(III)中的酯O原子和(IV)中的羰基O原子参与分子内C-H-O接触形成六元环。(Ⅱ)-(Ⅳ)的萘取代基与杂环最近的四个原子的二面角分别为73.3(1)°,71.0(1)°和74.3(1)°。  在所有三种结构中,NH 2基团中只有一个H原子参与N-H O [在(II)和(III)中]或N-H N [在(IV)中]分子间氢键,并且形成链[在(II)和(III)中]或二聚体[在(IV)中]。在(II)中,弱的分子间C-H O和C-H N氢键,以及在(III)中,分子间C-H O氢键将链沿着a轴连接成梯状。
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.
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发表时间: 2001
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影响因子: 0.8
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