Propargyl bromide → 7-Propynyloxy-5-hydroxy-4'-methoxyisoflavone

Participants

Reaction Steps

A mixture of 5,7-dihydroxy-4′-methoxyisoflavone (2.84 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 2.25 g of a product with the following characteristics: m.p. 174-176° C.; 1H NMR (CDCl3) δ: 2.6 (m, 1H), 3.86 (s, 3H), 4.8 (s, 2H), 647-7.91 (m, 7H), 12.90 (s, 1H).

Provenance & Evidence