反应详情

According to a similar procedure to that described in Example 4-(3), 6-(hydroxymethyl)-1 (3H)-isobenzofuranone (3.25 g, 20.8 mmol) obtained from Example 1-(4) or Example 1-(6) and activated manganese dioxide (33 g) were reacted, and the reaction mixture was worked up to afford the title compound as a crude solid. The crude solid was subjected to chromatography on a silica gel (40 g) column (eluent; ethyl acetate) to afford the title compound (2.45 g, 76% yield) as a solid (mp. 134° C.)