ethyl 2-formylhexanoate

反应条件: temp:30.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Recombinant Escherichia coli HB101 (PNTRS) (Accession Number: FERM BP-08545) was inoculated in 50 ml of 2× YT medium (containing 1.6% of tripeptone, 1.0% of yeast extract, 0.5% of NaCl, and 50 mg of zinc sulfate.7H2O, pH=7.0) sterilized in a 500-ml Sakaguchi Flask and incubated while shaking at 30° C. for 40 hours. To 25 ml of the resultant culture solution, 1,000 units of glucose dehydrogenase (manufactured by Amano Enzyme Inc.), 2.5 g of ethyl 2-formylhexanoate, 3 mg of NAD, 4 g of glucose, and 50 mg of zinc sulfate.7H2O were added, the culture solution was stirred at 30° C. for 24 hours while adding 2.5 M aqueous solution of sodium hydroxide dropwise to the culture solution to adjust to pH 6.5. After completion of the reaction, 100 ml of ethyl acetate was added to the reaction solution for extraction and the organic layer was distilled off under reduced pressure. Thereafter, the product was purified by silica gel chromatography to obtain an oily ethyl (R)-2-hydroxymethylhexanoate. The yield was 90% and the optical purity was 93.6% e.e. Note that analysis for optical purity was performed as follows. The product was derivatized with a HPLC labeling agent (3,5-dinitrobenzoyl chloride), and analyzed by HPLC using a Chiralcel OD-H column, 0.46×25 cm I.D. (manufactured by Daicel Chemical Industries, Ltd.). 7H2O were added the culture solution was stirred at 30° C. for 24 hours was added to the reaction solution for extraction the organic layer was distilled off under reduced pressure Thereafter, the product was purified by silica gel chromatography

反应条件: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: First, 60 g of 60% NaH was suspended in 600 ml of THF and 72.1 g of ethyl hexanoate was added dropwise to the suspension solution thus prepared at room temperature. After the suspension solution was raised in temperature to 40° C. and stirred for 15 minutes, 185.2 g of ethyl formate was added dropwise for 6 hours. Furthermore, 30 g of 60% NaH and 92.6 g of ethyl formate were divided into four parts and each part was added separately. Afterward, the solution mixture was stirred at 40° C. for 3 hours. thus prepared at room temperature each part was added separately Afterward, the solution mixture was stirred at 40° C. for 3 hours