Acta Crystallographica Section C

Crystal Structure Communications

Volume 63, Part 12 (December 2007)

organic compounds

bm3039 scheme

Acta Cryst. (2007). C63, o685-o689    [ doi:10.1107/S0108270107049001 ]

Three sterically hindered 6-amino-5-cyano-2-methyl-4-(1-naphth­yl)-4H-pyran-3-carboxyl­ate derivatives

V. N. Nesterov, D. J. Wiedenfeld, S. V. Nesterova and L. F. Hastings

Abstract: 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.

Formula: C21H20N2O4, C21H20N2O3 and C20H18N2O3

hkldisplay filedownload file

Structure factor file (CIF format) (176.2 kbytes)
[ doi:10.1107/S0108270107049001/bm3039IIsup2.hkl ]
Contains datablock II

hkldisplay filedownload file

Structure factor file (CIF format) (173.0 kbytes)
[ doi:10.1107/S0108270107049001/bm3039IIIsup3.hkl ]
Contains datablock III

hkldisplay filedownload file

Structure factor file (CIF format) (167.4 kbytes)
[ doi:10.1107/S0108270107049001/bm3039IVsup4.hkl ]
Contains datablock IV


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