Trimethylsilyl cyanide → 7-Methoxy-4-cyano chrom-3-ene

Reaktionsgleichung

[CH3:1][O:2][C:3]1[CH:12]=[C:11]2[C:6]([C:7](=O)[CH2:8][CH2:9][O:10]2)=[CH:5][CH:4]=1.C[Si]([C:18]#[N:19])(C)C>[Zn+2].[I-].[I-].CC#N>[CH3:1][O:2][C:3]1[CH:12]=[C:11]2[C:6]([C:7]([C:18]#[N:19])=[CH:8][CH2:9][O:10]2)=[CH:5][CH:4]=1

Komponenten

Versuchsvorschrift

7-Methoxy-4-chromanone (7 g) was added to trimethylsilyl cyanide (TMSCN) (7 ml), CH3CN (10 ml) and a catalytic amount of ZnI2 and refluxed for 2 hrs. The reaction was cooled, evaporated to dryness, then isopropyl alcohol saturated with HCl(g) (100 ml) was added and this solution refluxed 2 hrs. The reaction was cooled, evaporated to dryness, and saturated aqueous NaCl added. This was then extracted with CH2Cl2, the organic layer separated, dried (Na2SO4), filtered and evaporated affording 7.1 g of product. IR(CHCl3): 2218 cm-1.