2-Acetylhydroquinone → 6-Hydroxyspiro[2H-1-benzopyran-2,1′-cyclobutan]-4(3H)-one

Participants

Reaction Steps

The title compound was prepared from 2′,5′-dihydroxyacetophenone (10 g, 65.724 mmol) and cyclobutanone (13.29 ml, 131.44 mmol), in the presence of pyrrolidine (10.79 ml) by similar procedure as described in Step 1 of Intermediate 1 to give 10 g of the product; 1H NMR (300 MHz, CDCl3) δ 1.63-1.73 (m, 2H), 1.84-1.95 (m, 2H), 2.05-2.15 (m, 2H), 2.23-2.33 (m, 2H), 6.85 (d, J=8.7 Hz, 1H), 7.06 (d, J=9.0 Hz, 1H), 7.33 (s, 1H).

Provenance & Evidence