(4S)-4-benzyl-3-[(2S,4S)-2,4-dimethylhexanoyl]-1,3-oxazolidin-2-one | 185201-04-1

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑烷类
• 英文名称: (4S)-4-benzyl-3-[(2S,4S)-2,4-dimethylhexanoyl]-1,3-oxazolidin-2-one
• CAS: 185201-04-1
• 化学式: C₁₈H₂₅NO₃
• 分子量: 303.401
• InChiKey: KOKIOIHQLMUCLI-DZKIICNBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.4
• 重原子数：
  22
• 可旋转键数：
  6
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.56
• 拓扑面积：
  46.6
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  (4S)-4-benzyl-3-[(2S,4S)-2,4-dimethylhexanoyl]-1,3-oxazolidin-2-one 在 甲醇 、 lithium hydroxide 、 锂硼氢 、 草酰氯 、 二甲基亚砜 、 三乙胺 作用下， 以 四氢呋喃 、 乙醚 、 水 为溶剂， 反应 91.17h， 生成 (2E,4S,6S)-4,6-dimethyl-2-octenoic acid
  参考文献：
  名称：

  Total Synthesis of Zaragozic Acid A (Squalestatin S1). Degradation to a Relay Compound and Reassembly of the Natural Product

  摘要：

  Zaragozic acid A (squalestatin S1) (1) was converted into the simpler derivative 2, which was reconverted into the natural product, thus establishing 2 as a viable relay compound for total synthesis of 1. The degradation (Scheme 1) consisted of formation of the tri-tert-butyl ester (3), from which the two side chains were sequentially removed to obtain 8. Aldehyde 8 was converted into dimethyl acetal 2 in standard fashion. The C6 acyl side chain 14 was prepared from (S)-2-methylbutanol (''active amyl alcohol''), and the desired 4S configuration was obtained by use of Evans asymmetric enolate methylation (Scheme 2). The C1 alkyl side chain was prepared as stannane 23a from (R)-2-methyl-3-phenylpropanol (21) as shown in Scheme 5. For conversion of 2 back into zaragozic acid A, the dimethyl acetal was first converted into the cyclic acetal 17, thus protecting the C7 hydroxyl group. The remaining hydroxyl group was then acylated with acid 14 to obtain 18, which was transformed into aldehyde 20 (Scheme 4). The C1 alkyl chain was elaborated by the addition of a chiral alpha-alkoxyorganocerium reagent, obtained from 23a, to aldehyde 20. The resulting mixture of diastereomeric secondary alcohols was converted into zaragozic acid A (1) in six steps (Scheme 6).

  DOI：

  10.1021/jo961533m
• 作为产物：
  描述：

  2-Oxazolidinone, 3-[(4S)-4-methyl-1-oxohexyl]-4-(phenylmethyl)-, (4S)- 、 碘甲烷 在 sodium hexamethyldisilazane 作用下， 生成 (4S)-4-benzyl-3-[(2R,4S)-2,4-dimethylhexanoyl]-1,3-oxazolidin-2-one 、 (4S)-4-benzyl-3-[(2S,4S)-2,4-dimethylhexanoyl]-1,3-oxazolidin-2-one
  参考文献：
  名称：

  Total Synthesis of Zaragozic Acid A (Squalestatin S1). Degradation to a Relay Compound and Reassembly of the Natural Product

  摘要：

  Zaragozic acid A (squalestatin S1) (1) was converted into the simpler derivative 2, which was reconverted into the natural product, thus establishing 2 as a viable relay compound for total synthesis of 1. The degradation (Scheme 1) consisted of formation of the tri-tert-butyl ester (3), from which the two side chains were sequentially removed to obtain 8. Aldehyde 8 was converted into dimethyl acetal 2 in standard fashion. The C6 acyl side chain 14 was prepared from (S)-2-methylbutanol (''active amyl alcohol''), and the desired 4S configuration was obtained by use of Evans asymmetric enolate methylation (Scheme 2). The C1 alkyl side chain was prepared as stannane 23a from (R)-2-methyl-3-phenylpropanol (21) as shown in Scheme 5. For conversion of 2 back into zaragozic acid A, the dimethyl acetal was first converted into the cyclic acetal 17, thus protecting the C7 hydroxyl group. The remaining hydroxyl group was then acylated with acid 14 to obtain 18, which was transformed into aldehyde 20 (Scheme 4). The C1 alkyl chain was elaborated by the addition of a chiral alpha-alkoxyorganocerium reagent, obtained from 23a, to aldehyde 20. The resulting mixture of diastereomeric secondary alcohols was converted into zaragozic acid A (1) in six steps (Scheme 6).

  DOI：

  10.1021/jo961533m

文献信息

• Structural Determination of (−)-SCH 64874 and Hirsutellomycin by Semisynthesis
  作者：Hidetoshi Tokuyama、Kaori Yamada、Hideto Fujiwara、Juri Sakata、Kentaro Okano、Malipan Sappan、Masahiko Isaka

  DOI：10.1021/acs.joc.6b02452

  日期：2017.1.6

  relative stereochemistry of the β-keto carboxylic acid chain of the analogous alkaloid hirsutellomycin was determined in a stepwise manner. The C4′–C6′ syn relationships were predicted by comparing the NMR data of the corresponding ester fragments with that of hirsutellomycin. The relative stereochemistry of the whole molecule, including the epimerizable C2′ stereocenter, was determined by introduction

  通过半合成确定C 2对称的表二硫代二酮哌嗪生物碱SCH 64874的结构。通过比较四个可能的非对映异构的β-羟基羧酸片段与SCH 64874的NMR数据，可以确定具有三个手性中心的β-羟基羧酸链的相对立体化学。两种对映体的β-羟基羧酸揭示了SCH 64874的相对立体化学。以逐步方式确定了类似生物碱hirsutellomycin的β-酮羧酸链的相对立体化学。该C4'-C6' SYN通过将相应酯片段的NMR数据与hirsutellomycin的NMR数据进行比较，可以预测二者之间的相关性。整个分子的相对立体化学，包括可差向异构的C2'立体中心，是通过将四个可能的侧链引入双脱硫基二（甲硫基）脱乙酰基花生四烯酸核心来确定的。我们发现，C2'的立体化学与受核心结构影响的热力学稳定形式的立体化学趋同。
• Total Synthesis of Zaragozic Acid A (Squalestatin S1). Degradation to a Relay Compound and Reassembly of the Natural Product
  作者：Doris Stoermer、Stéphane Caron、Clayton H. Heathcock

  DOI：10.1021/jo961533m

  日期：1996.1.1

  Zaragozic acid A (squalestatin S1) (1) was converted into the simpler derivative 2, which was reconverted into the natural product, thus establishing 2 as a viable relay compound for total synthesis of 1. The degradation (Scheme 1) consisted of formation of the tri-tert-butyl ester (3), from which the two side chains were sequentially removed to obtain 8. Aldehyde 8 was converted into dimethyl acetal 2 in standard fashion. The C6 acyl side chain 14 was prepared from (S)-2-methylbutanol (''active amyl alcohol''), and the desired 4S configuration was obtained by use of Evans asymmetric enolate methylation (Scheme 2). The C1 alkyl side chain was prepared as stannane 23a from (R)-2-methyl-3-phenylpropanol (21) as shown in Scheme 5. For conversion of 2 back into zaragozic acid A, the dimethyl acetal was first converted into the cyclic acetal 17, thus protecting the C7 hydroxyl group. The remaining hydroxyl group was then acylated with acid 14 to obtain 18, which was transformed into aldehyde 20 (Scheme 4). The C1 alkyl chain was elaborated by the addition of a chiral alpha-alkoxyorganocerium reagent, obtained from 23a, to aldehyde 20. The resulting mixture of diastereomeric secondary alcohols was converted into zaragozic acid A (1) in six steps (Scheme 6).