反应详情

As described in General Procedure P, 8-chloro-7-isopropoxy-4-isopropyl-2,2-dimethyl-2H-chromene-6-carbaldehyde, (Compound 135, 0.98 g, 3.05 mmol) was treated with ethylmagnesium bromide (3 M in ether, 1.6 mL, 4.9 mmol) to give rise to the title compound as a yellow foam.