Research Article: Ethyl 2-amino-4-(4-fluoro­phen­yl)-6-meth­oxy-4H-benzo[h]chromene-3-carboxyl­ate

Date Published: June 01, 2012

Publisher: International Union of Crystallography

Author(s): Ahmed M. El-Agrody, Mohamed A. Al-Omar, Abdel-Galil E. Amr, Tze Shyang Chia, Hoong-Kun Fun.


In the title compound, C23H20FNO4, the fluoro-substituted benzene ring is approximately perpendicular to the mean plane of the 4H-benzo[h]chromene ring system [maximum deviation = 0.264 (1) Å], with a dihedral angle of 83.79 (6)°. The pyran ring adopts a flattened boat conformation. The meth­oxy group is slightly twisted from the attached benzene ring of the 4H-benzo[h]chromene moiety [C—O—C—C = −2.1 (2)°]. An intra­molecular N—H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by N—H⋯O and N—H⋯F hydrogen bonds into a layer parallel to the bc plane. The crystal packing also features C—H⋯π inter­actions.

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For background to and applications of 4H-chromene and its derivatives, see: Jeso & Nicolaou (2009 ▶); Alvey et al. (2008 ▶, 2009 ▶); Symeonidis et al. (2009 ▶); Brühlmann et al. (2001 ▶); Bedair et al. (2001 ▶); El-Agrody et al. (2002 ▶, 2011 ▶); Abd-El-Aziz et al. (2004 ▶); Sabry et al. (2011 ▶). For ring puckering parameters, see: Cremer & Pople (1975 ▶). For hydrogen-bond motifs, see: Bernstein et al. (1995 ▶).




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