(2S,3S,4S,5R,6E)-1-(benzyloxy)-2,4-dimethyl-6-octene-3,5-diol | 128146-35-0

• 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: (2S,3S,4S,5R,6E)-1-(benzyloxy)-2,4-dimethyl-6-octene-3,5-diol
• CAS: 128146-35-0；128241-48-5
• 化学式: C₁₇H₂₆O₃
• 分子量: 278.392
• InChiKey: MQWSQLQGAOFZDF-NCJPJPLESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.77
• 重原子数：
  20.0
• 可旋转键数：
  8.0
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.53
• 拓扑面积：
  49.69
• 氢给体数：
  2.0
• 氢受体数：
  3.0

反应信息

• 作为反应物：
  描述：

  (2S,3S,4S,5R,6E)-1-(benzyloxy)-2,4-dimethyl-6-octene-3,5-diol 在 2,6-二甲基吡啶 、 草酰氯 、 LiDBB 、 二甲基亚砜 、 三乙胺 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 3.5h， 生成 (2R,3R,4S,5R,6E)-3,5-bis(tert-butyldimethylsiloxy)-2,4-dimethyl-6-octenal
  参考文献：
  名称：

  Studies in macrolide synthesis: A stereocontrolled synthesis of a (9S)-macrolide intermediate for oleandomycin using chiral boron reagents.

  摘要：

  The (9S)-macrolide 1 (P = TBS) was prepared in 14 steps (5% yield) with 63% overall ds starting from the ethyl ketone (S)-2. The C1-C7 and C8-C13 segments, 3 and 4, were obtained via boron enolate aldol reactions mediated by (+)- and (-)-(Ipc)2BOTf, respectively.

  DOI：

  10.1016/s0040-4039(00)91728-3
• 作为产物：
  描述：

  2,2,2-三氯乙酰胺苄酯 在 锂硼氢 、 三氟甲磺酸 、 pH 7 buffer 、 甲基二丁基硼酸酯 、 双氧水 、 三甲基铝 、 (-)-diisopinocampheylboron triflate 、 N,N-二异丙基乙胺 作用下， 以 四氢呋喃 、 二氯甲烷 、 环己烷 为溶剂， 反应 19.25h， 生成 (2S,3S,4S,5R,6E)-1-(benzyloxy)-2,4-dimethyl-6-octene-3,5-diol
  参考文献：
  名称：

  Studies in Macrolide Synthesis: A Stereocontrolled Synthesis of Oleandolide Employing Reagent- and Substrate-Controlled Aldol Reactions of (S)-1-(Benzyloxy)-2-methylpentan-3-one

  摘要：

  A highly stereocontrolled total synthesis of oleandolide (2), the aglycon of the macrolide antibiotic oleandomycin (1), has been completed in 8% overall yield (20 steps longest Linear sequence, 26 steps in total) with 90% overall diastereoselectivity. Initially, reagent-controlled syn aldol reactions of (S)-1-(benzyloxy)-2-methylpentan-3-one ((S)-8) were employed to prepare adducts 6 (SS) and 7 (SA), which were elaborated to provide the two advanced fragments 33 and 27, respectively. Coupling of these fragments followed by functional group manipulation and macrolactonization gave the macrocyclic ketone 42, possessing S configuration at C-9. Elaboration of 42 to oleandolide, however, proved troublesome. Substrate-controlled syn and anti aldol reactions of ketone (S)-8, meanwhile, provided the adducts 6 (SS) and 7 (AA), which enabled synthesis, via fragments 64 and 60, of the key macrocyclic ketone intermediate 69, having R configuration at C-9. Stereoselective epoxidation of ketone 69, by reaction with dimethylsulfonium methylide under macrocyclic stereocontrol, provided the (8R)-epoxide 83; subsequent elaboration then gave oleandolide (2).

  DOI：

  10.1021/ja00104a010

文献信息

• Aldol reactions in polypropionate synthesis: High π-face selectivity of enol borinates from α-chiral methyl and ethyl ketones under substrate control
  作者：Ian Paterson、Jonathan M. Goodman、Masahiko Isaka

  DOI：10.1016/s0040-4039(01)93440-9

  日期：——

  Use of (c-C6H11)2BCl in the anti-selective aldol reaction of the α-chiral ethylketone 2 leads to high stereoselectivity (>94%) for the 1,2-anti-2,4-anti isomer 7. The related α-chiral methylketone aldol reaction, 8 → 9, proceeds with 84–93% diasteroselectivity for a range of boron reagents.

  在α-手性乙酮2的抗选择性羟醛反应中使用（c -C 6 H 11）2 BCl会导致1,2-抗-2,4-抗异构体7具有较高的立体选择性（> 94％）。相关的α-手性甲基酮醛醇缩醛反应8 → 9，对一系列硼试剂的非对映选择性为84–93％。