rac-Dimethyl 2-(tert-butyl-amino)-5-oxo-4,5-dihydro-pyrano[3,2-c]chromene-3,4-dicarboxyl-ate.
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 by inter-molecular C-H⋯O hydrogen bonds. The 3-carboxyl-ate O atom is involved in both of them, having a bifurcated character.
S Antony
SA
Inglebert
K
K
Sethusankar
Yuvaraj
Y
Arun
Paramasivam T
PT
Perumal