(3R)-3-hydroxy-3-methylnonane-2,4-dione | 1421833-44-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (3R)-3-hydroxy-3-methylnonane-2,4-dione
• 英文别名: (R)-3-hydroxy-3-methylnonane-2,4-dione
• CAS: 1421833-44-4
• 化学式: C₁₀H₁₈O₃
• 分子量: 186.251
• InChiKey: LWAGDIOTWITDPB-SNVBAGLBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.3
• 重原子数：
  13
• 可旋转键数：
  6
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.8
• 拓扑面积：
  54.4
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  (2S,3R)-2,3-dihydroxy-3-methylnonan-4-one 在 sodium hypochlorite 、 2,2,6,6-四甲基哌啶氧化物 、 碳酸氢钠 、 potassium bromide 作用下， 以 二氯甲烷 、 水 为溶剂， 反应 0.83h， 以72%的产率得到(3R)-3-hydroxy-3-methylnonane-2,4-dione
  参考文献：
  名称：

  An enzymatic approach to the synthesis of optically pure (3R)- and (3S)-enantiomers of green tea flavor compound 3-hydroxy-3-methylnonane-2,4-dione

  摘要：

  Both (3R)- and (3S)-enantiomers of the chiral green tea flavor compound 3-hydroxy-3-methylnonane-2,4-dione were synthesized by the combined use of acetylacetoin synthase and acetylacetoin reductase from Bacillus licheniformis. The first enzyme was utilized to catalyze the homo-coupling of 2,3-octanedione and obtain the enantioenriched (3R)-3-hydroxy-3-methylnonane-2,4-dione (ee 44%). The NADH-dependent acetylacetoin reductase was then employed for the diastereoselective (de > 95%) C2 carbonyl reduction of the sole (3R)-enantiomer of the above 2,4-dione, thus affording the syn diol (2S,3R)-2,3-dihydroxy-3-methylnonan-4-one in enantiomerically pure form. While this step allowed for the recovery of unreacted, optically pure (3S)-3-hydroxy-3-methylnonae-2,4-dione, the corresponding (3R)-enantiomer was obtained by subsequent TEMPO-mediated oxidation of the syn dial intermediate. Moreover, using the title compounds as analytical standards, predominance of the (3R) enantiomer in the natural flavor compound was finally demonstrated by chiral GC-MS analysis. (C) 2012 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.molcatb.2012.08.015

文献信息

• Expanding the scope of enzymatic carboligation reactions in flow-mode: production of optically active tertiary alcohols with packed-bed micro-bioreactors
  作者：P. P. Giovannini、O. Bortolini、A. Cavazzini、R. Greco、G. Fantin、A. Massi

  DOI：10.1039/c4gc00838c

  日期：——

  Acetylacetoin synthase (AAS) from Bacillus licheniformis has been partially purified and immobilized on a silica support and its activity was tested under batch conditions in the homo-coupling of a set of α-diketones leading to valuable α-hydroxy ketone derivatives displaying a chiral tertiary alcohol functionality at the α-position. Next, the effectiveness of AAS heterogeneous catalysis has been evaluated

  地衣芽孢杆菌的乙酰丙酮化合酶（AAS）该化合物已部分纯化并固定在二氧化硅载体上，并在一批α-二酮的均相偶联中分批条件下测试了其活性，从而生成了宝贵的α-羟基酮衍生物，在α位上显示了手性叔醇官能度。接下来，通过制造相应的填充床微反应器（耐压不锈钢塔），在连续流动条件下评估了AAS非均相催化的有效性。已经证明，共价固定在二氧化硅载体上和流动方式协同作用有助于随着时间的流逝保持酶的活性，从而使得所制备的生物反应器可以长期操作（长达15天）来生产手性靶标。通过umpolung策略。
• An enzymatic approach to the synthesis of optically pure (3R)- and (3S)-enantiomers of green tea flavor compound 3-hydroxy-3-methylnonane-2,4-dione
  作者：Olga Bortolini、Pier Paolo Giovannini、Silvia Maietti、Alessandro Massi、Paola Pedrini、Gianni Sacchetti、Valentina Venturi

  DOI：10.1016/j.molcatb.2012.08.015

  日期：2013.1

  Both (3R)- and (3S)-enantiomers of the chiral green tea flavor compound 3-hydroxy-3-methylnonane-2,4-dione were synthesized by the combined use of acetylacetoin synthase and acetylacetoin reductase from Bacillus licheniformis. The first enzyme was utilized to catalyze the homo-coupling of 2,3-octanedione and obtain the enantioenriched (3R)-3-hydroxy-3-methylnonane-2,4-dione (ee 44%). The NADH-dependent acetylacetoin reductase was then employed for the diastereoselective (de > 95%) C2 carbonyl reduction of the sole (3R)-enantiomer of the above 2,4-dione, thus affording the syn diol (2S,3R)-2,3-dihydroxy-3-methylnonan-4-one in enantiomerically pure form. While this step allowed for the recovery of unreacted, optically pure (3S)-3-hydroxy-3-methylnonae-2,4-dione, the corresponding (3R)-enantiomer was obtained by subsequent TEMPO-mediated oxidation of the syn dial intermediate. Moreover, using the title compounds as analytical standards, predominance of the (3R) enantiomer in the natural flavor compound was finally demonstrated by chiral GC-MS analysis. (C) 2012 Elsevier B.V. All rights reserved.