2-Ethyl-8-methoxymethyl-4-oxo-4H-chromen-7-yl (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate

Acta Crystallographica Section E

Structure Reports Online

Volume 66, Part 6 (June 2010)

organic compounds

bh2283 scheme

Acta Cryst. (2010). E66, o1459 [ doi:10.1107/S1600536810018921 ]

2-Ethyl-8-methoxymethyl-4-oxo-4H-chromen-7-yl (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate

Y. Qiu, Y. Chen and P. Xia

Abstract: The title compound C₂₃H₂₆O₇, was prepared by esterification of 2-ethyl-7-hydroxy-8-methoxymethyl-4H-chromen-4-one with (S)-(-)-camphanic chloride. The two rings of the chromone system are coplanar, making a dihedral angle of 1.99 (19)°, and the camphanoyl unit substituted at 7-O retains the original bicyclo[2.2.1]heptane conformation of the starting reagent.