Ethyl Acetate → 3-Ethyl-3,4-dihydro-1H-naphtho[2,3-c]pyran-5,10-dione

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Reaction Steps

Following the procedure described in step 4, example 26, the starting quinone from step 3 herein (250 mg; 1.30 mmol) and 1-acetoxy-1,3-butadiene (876 μl; 7.8 mmol) were reacted in toluene (10 ml) to yield after chromatography using 2% ethyl acetate in toluene the title compound (62 mg; 20%) along with mixed fractions containing a lot of desired titled product (230 mg), M.P.: 98°-101° C.

Provenance & Evidence