(+/-)-lactyl butyrate | 132312-49-3

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: (+/-)-lactyl butyrate
• 英文别名: α-Valeryloxypropionsaeure；2-Pentanoyloxypropanoic acid
• CAS: 132312-49-3
• 化学式: C₈H₁₄O₄
• 分子量: 174.197
• InChiKey: CPZYPJCMZKMCNM-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.5
• 重原子数：
  12
• 可旋转键数：
  6
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.75
• 拓扑面积：
  63.6
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (+/-)-lactyl butyrate 、 异丁烯 在 硫酸 作用下， 以 乙醚 为溶剂， 生成 (+/-)-lactyl butyrate tert-butyl ester
  参考文献：
  名称：

  A rule to predict which enantiomer of a secondary alcohol reacts faster in reactions catalyzed by cholesterol esterase, lipase from Pseudomonas cepacia, and lipase from Candida rugosa

  摘要：

  The enantioselectivity of the title enzymes for more than 130 esters of secondary alcohols is correlated by a rule based on the sizes of the substituents at the stereocenter. This rule predicts which enantiomer of a racemic secondary alcohol reacts faster for 14 of 15 substrates of cholesterol esterase (CE), 63 of 64 substrates of lipase from Pseudomonas cepacia (PCL), and 51 of 55 cyclic substrates of lipase from Candida rugosa (CRL). The enantioselectivity of CRL for acyclic secondary alcohols is not reliably predicted by this rule. This rule implies that the most efficiently resolved substrates are those having substituents which differ significantly in size. This hypothesis was used to design syntheses of two chiral synthons: esters of (R)-lactic acid and (S)-(-)-4-acetoxy-2-cyclohexen-1-one, 70. As predicted, the acetate group of the methyl ester of lactyl acetate was hydrolyzed by PCL with low enantioselectivity because the two substituents, CH3 and C(O)OCH3, are similar in size. To improve the enantioselectivity, the methyl ester was replaced by a tert-butyl ester. The acetate group of the tert-butyl ester of lactyl acetate was hydrolyzed with high enantioselectivity (E > 50). Enantiomerically pure (R)-(+)-tert-butyl lactate (> 98% ee, 6.4 g) was prepared by kinetic resolution. For the second example, low enantioselectivity (E < 3) was observed in the hydrolysis of cis-1,4-diacetoxycyclohex-2-ene, a meso substrate where the two substituents, CH2CH2 and CH = CH, are similar in size. To improve enantioselectivity, the size of the CH = CH substituent was increased by addition of Br2. The new substrate was hydrolyzed with high enantioselectivity (E > 65) using either CE or CRL. Enantiomerically pure 70 (98% ee) was obtained after removal of the bromines with zinc and oxidation with CrO3/pyridine.

  DOI：

  10.1021/jo00008a016
• 作为产物：
  描述：

  乳酸 、 丁酰氯 生成 (+/-)-lactyl butyrate
  参考文献：
  名称：

  A rule to predict which enantiomer of a secondary alcohol reacts faster in reactions catalyzed by cholesterol esterase, lipase from Pseudomonas cepacia, and lipase from Candida rugosa

  摘要：

  The enantioselectivity of the title enzymes for more than 130 esters of secondary alcohols is correlated by a rule based on the sizes of the substituents at the stereocenter. This rule predicts which enantiomer of a racemic secondary alcohol reacts faster for 14 of 15 substrates of cholesterol esterase (CE), 63 of 64 substrates of lipase from Pseudomonas cepacia (PCL), and 51 of 55 cyclic substrates of lipase from Candida rugosa (CRL). The enantioselectivity of CRL for acyclic secondary alcohols is not reliably predicted by this rule. This rule implies that the most efficiently resolved substrates are those having substituents which differ significantly in size. This hypothesis was used to design syntheses of two chiral synthons: esters of (R)-lactic acid and (S)-(-)-4-acetoxy-2-cyclohexen-1-one, 70. As predicted, the acetate group of the methyl ester of lactyl acetate was hydrolyzed by PCL with low enantioselectivity because the two substituents, CH3 and C(O)OCH3, are similar in size. To improve the enantioselectivity, the methyl ester was replaced by a tert-butyl ester. The acetate group of the tert-butyl ester of lactyl acetate was hydrolyzed with high enantioselectivity (E > 50). Enantiomerically pure (R)-(+)-tert-butyl lactate (> 98% ee, 6.4 g) was prepared by kinetic resolution. For the second example, low enantioselectivity (E < 3) was observed in the hydrolysis of cis-1,4-diacetoxycyclohex-2-ene, a meso substrate where the two substituents, CH2CH2 and CH = CH, are similar in size. To improve enantioselectivity, the size of the CH = CH substituent was increased by addition of Br2. The new substrate was hydrolyzed with high enantioselectivity (E > 65) using either CE or CRL. Enantiomerically pure 70 (98% ee) was obtained after removal of the bromines with zinc and oxidation with CrO3/pyridine.

  DOI：

  10.1021/jo00008a016

文献信息

• EP0663827A4
  申请人：——

  公开号：EP0663827A4

  公开（公告）日：1995-11-15
• TOCOLYTIC OXYTOCIN RECEPTOR ANTAGONISTS
  申请人：MERCK & CO. INC.

  公开号：EP0663827A1

  公开（公告）日：1995-07-26
• SUBSTITUTED PIPERAZINYLCAMPHOR DERIVATIVES AS OXYTOCIN ANTAGONISTS
  申请人：MERCK & CO. INC.

  公开号：EP0708765A1

  公开（公告）日：1996-05-01
• EP0708765A4
  申请人：——

  公开号：EP0708765A4

  公开（公告）日：1996-06-26
• METHOD FOR IMPROVING REPRODUCTIVE EFFICIENCY IN FARM ANIMALS
  申请人：Merck & Co., Inc.

  公开号：EP0783306A1

  公开（公告）日：1997-07-16