反应详情

A mixture of 0.55 g. (2.33 mmol) of (S)-(+)-6-hydroxy-2,5,7,8-tetramethylchroman-2-methanol, 790 mg. (5.72 mmol) of anhydrous K2CO3, 0.68 ml. (748 mg; 5.93 mmol) of benzyl chloride (distilled from and stored over K2CO3) and 4.5 ml. of DMF was stirred for 22 hrs. at room temperature then poured into H2O and worked up with ether in the usual manner. There was obtained 0.89 g. of a yellow oily product which was chromatographed on silica gel (35 g.). Elution with 19:1 and 9:1 benzene-ethyl acetate gae 724 mg. (97.1%) of (S)-(-)-6-benzyloxy-2,5,7,8-tetramethylchroman-2-methanol as a colorless solid, mp 66°-69.5°; [α]25D-2.35° (c 1.2, CHCl3).

1. additionA mixture of 0.55 g
2. customThere was obtained 0.89 g
3. customof a yellow oily product which was chromatographed on silica gel (35 g.)
4. washElution with 19:1 and 9:1 benzene-ethyl acetate gae 724 mg