Propargyl bromide → 7-Propynyloxyflavone

Participants

Reaction Steps

A mixture of 7-hydroxyflavone (2.38 g, 0.01 mol), K2CO3 (2.8 g, 0.02 mol), Kl (0.166 g, 0.001 mol), propargyl bromide (1.78 g, 0.015 mol) and acetone (100 mL) was refluxed 10 h and hot filtered. The solvent was evaporated and the residue was crystallized by toluene. This yields 2.58 g of a product with the following characteristics: m.p. 199-200° C.; 1H NMR (CDC13) δ: 2.6 (m, 1H), 4.8 (s, 2H), 6.75-8.18 (m, 9H).

Provenance & Evidence