反应详情

温度

60 °C

4.9 g of concentrated sulfuric acid were added dropwise to a stirred mixture of 4.75 g (27.6 mmole) of 2-methyl-1,4-naphthoquinone, 2.71 g (41.4 mmole) of zinc powder, 15 mL of methanol and 15 mL of toluene, in an ice bath. After the addition was complete, the reaction mixture was stirred for 4.5 hours at 60° C. The reaction product was extracted with ethyl acetate, washed with water then brine, dried over sodium sulfate, filtered, then evaporated under reduced pressure to yield 4.25 gm (81% yield) of the title compound as an off-white powder having a melting point of 102-103° C. and an 1HNMR as follows: (300 MHz, DMSO-d6) δ 2.38 (s, 3H), 3.91 (s, 3H), 6.76 (s, 1H), 7.42(m, 2H), 8.04 (d, 1H, J=8.1 Hz), 8.14 (d, 1H, J=8.1 Hz), 8.50(bs, 1H). The mass spectrum showed a molecular ion at m/z 188.

1. additionAfter the addition
2. extractionThe reaction product was extracted with ethyl acetate
3. washwashed with water
4. dry with materialbrine, dried over sodium sulfate
5. filtrationfiltered
6. customevaporated under reduced pressure