反应详情

70 ml of acetyl chloride were added with stirring to a mixture of 90 ml of methylal and 2.4 ml of methanol and the mixture was allowed to stand for several hours to obtain chloromethyl methyl ether. 6.7 g of lithium hydride were added over 30 minutes at about 15°±2° C. to a solution of 110 g of the lactone of (1R,cis) 2,2-dimethyl-3-dihydroxymethyl-cyclopropane-carboxylic acid in 500 ml of tetrahydrofuran and after stirring the mixture for 30 minutes, the mixture containing chloroethyl methyl ether was added thereto. The mixture was stirred at 20° C. for four hours and was poured into aqueous sodium bircarbonate solution. The mixture was extracted with isopropyl ether and the organic phase was washed with water, dried and evaporated to dryness under reduced pressure to obtain 117 g of raw product which was distilled to obtain methoxymethyl (1R,cis) 2,2-dimethyl-3-formyl-cyclopropane-carboxylate with a boiling point of 65° to 70° C. at 5×10 -2 mm Hg.

1. additionwas added
2. stirringThe mixture was stirred at 20° C. for four hours
3. extractionThe mixture was extracted with isopropyl ether
4. washthe organic phase was washed with water
5. customdried
6. customevaporated to dryness under reduced pressure
7. customto obtain 117 g of raw product which
8. distillationwas distilled