Xiaodong Chen, Jiao Ye, A. Hu
2012
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Journal
Chinese Journal of Organic Chemistry
Abstract
5,6-Dimethoxy- N -[( R )-4-methoxy-2-(prop-1-en-2-yl)-2,3-dihydrobenzofuran-5-yl]-1,1 a ,2,7 b -tetrahydrocyclopropa-[ c ]chromene-7 b -carboxamide ( 5 ) was prepared by etherification, oximation and Beckmann rearrangement from 5,6-dimeth-oxy-1,1 a ,2,7 b -tetrahydrocyclopropa[ c ]chromen-7 b -yl(( R )-4-hydroxy-2-(prop-1-en-2-yl)-2,3-dihydrobenzofuran-5-yl)-methanone ( 2 ) which synthesized from the reaction of the rotenone and dimethyloxosulphonium methylide. Their structures were identified by 1 H NMR and MS techniques and elemental analysis. The crystal structures of compounds 2 and 5 were determined by X-ray single crystal diffraction analysis. The crystal of 5 belongs to triclinic, space group P 1 with cell parameters a = 0.95772(5) nm, b = 1.06591(6) nm, c = 1.30112(7) nm, α = 111.8460(10)°, β = 109.8870(10)°, γ = 93.0870°, V = 1.13429(11) nm 3 , Z = 2, D c = 1.281 g/cm 3 , µ (Mo K α ) = 0.092 mm - 1 , F (000) = 464.