反应详情

Starting with 4.84 g (21.2 mmol) of 1,2-dihydro-8-methoxy-3H-naphtho[2,1-b]pyran-3-one from the preceding example, the title compound (3.19 g; 70.3%) was obtained as an off-white solid, mp 189°-199° C. (recrystallized from ethanol-ethyl acetate), using the procedure of example 221.