反応 #1121759

反応方程式

(R)-2-ethoxycarbonylmethyl-4-triethylsilyloxy-2-cyclopenten-1-one

sodium hydroxide

→

(R)-2-hydroxycarbonylmethyl-4-triethylsiloxy-2-cyclopenten-1-one

収率 66.2%

溶媒

phosphate

反応条件

後処理

1. 1
   その他finally adjusted to 7.0 upon completion of the reaction
2. 2
   その他the Lipase was removed by filtration
3. 3
   抽出The reaction mixture was extracted with 100 ml of ethyl acetate twice
4. 4
   抽出The aqueous layer was extracted twice again
5. 5
   乾燥dried over anhydrous magnesium sulfate
6. 6
   ろ過filtered
7. 7
   濃縮concentrated

実験手順

20 g of (R)-2-ethoxycarbonylmethyl-4-triethylsilyloxy-2-cyclopenten-1-one obtained from Example 35 and 2 g of Candida antarcitica lipase were suspended in 200 ml of phosphate buffer (10 mM, pH 6.5-7.5) and stirred at room temperature. The pH of the solution was maintained by 1N sodium hydroxide solution and finally adjusted to 7.0 upon completion of the reaction and the Lipase was removed by filtration. The reaction mixture was extracted with 100 ml of ethyl acetate twice. The pH of the aqueous layer was further adjusted to 6.0 using a saturated sodium hydrogensulfate solution. The aqueous layer was extracted twice again using 100 ml of ethyl acetate. The organic layers were combined, dried over anhydrous magnesium sulfate, filtered, and concentrated to obtain (R)-2-hydroxycarbonylmethyl-4-triethylsiloxy-2-cyclopenten-1-one (12 g, 65% yield). [α]D: +19.8° (c 1.0, CH3CN);

出典