(S)-4-Bromo-3-hydroxy-4-pentenoic acid (S)-1,2,2-triphenyl-2-hydroxyethyl ester | 147986-42-3

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 二苯乙烯类
• 英文名称: (S)-4-Bromo-3-hydroxy-4-pentenoic acid (S)-1,2,2-triphenyl-2-hydroxyethyl ester
• 英文别名: [(1S)-2-hydroxy-1,2,2-triphenylethyl] (3S)-4-bromo-3-hydroxypent-4-enoate
• CAS: 147986-42-3
• 化学式: C₂₅H₂₃BrO₄
• 分子量: 467.359
• InChiKey: ITOLNMYSBFOOLK-UPVQGACJSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.4
• 重原子数：
  30
• 可旋转键数：
  9
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.16
• 拓扑面积：
  66.8
• 氢给体数：
  2
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  (S)-4-Bromo-3-hydroxy-4-pentenoic acid (S)-1,2,2-triphenyl-2-hydroxyethyl ester 在 palladium diacetate 、 三苯基膦 咪唑 、 18-冠醚-6 、 Zeolite 3 Angstroem 、 双(三甲基硅烷基)氨基钾 、 二异丁基氢化铝 、 potassium carbonate 、 pyridinium chlorochromate 、 magnesium bromide 、 lithium diisopropyl amide 作用下， 以 乙醚 、 二氯甲烷 、 N,N-二甲基甲酰胺 、 乙腈 为溶剂， 反应 6.83h， 生成 methyl (Z,3S,5R)-[3,5-bis(tert-butyldimethylsilyl)oxy-2-methylenecyclohexylidene]acetate
  参考文献：
  名称：

  An efficient asymmetric synthesis of 1.alpha.,25-(OH)2 vitamin D3 A-ring synthon

  摘要：

  Chiral synthesis of the A-ring synthon 3 of 1alpha,25-dihydroxyvitamin D3 (1a) based on palladium-catalyzed cyclization of 8-bromo-2,8-nonadienoates is described. Reaction of (E)-4b and (Z)-4d in the presence of Pd(OAc)2, PPh3, and K2CO3 gave (E)-3b and (Z)-3d, respectively. Optically active 4d was prepared from 24 by asymmetric aldol reaction using 31, which was cyclized to 3d. With further reactions, 1alpha,25-dihydroxyvitamin D3 (1a) was obtained.

  DOI：

  10.1021/jo00061a028
• 作为产物：
  描述：

  2-溴丙烯醛 、 (S)-(-)-1,1,2-三苯基-1,2-丁二醇2-醋酸酯 在 magnesium bromide 、 lithium diisopropyl amide 作用下， 生成 (S)-4-Bromo-3-hydroxy-4-pentenoic acid (S)-1,2,2-triphenyl-2-hydroxyethyl ester
  参考文献：
  名称：

  An efficient asymmetric synthesis of 1.alpha.,25-(OH)2 vitamin D3 A-ring synthon

  摘要：

  Chiral synthesis of the A-ring synthon 3 of 1alpha,25-dihydroxyvitamin D3 (1a) based on palladium-catalyzed cyclization of 8-bromo-2,8-nonadienoates is described. Reaction of (E)-4b and (Z)-4d in the presence of Pd(OAc)2, PPh3, and K2CO3 gave (E)-3b and (Z)-3d, respectively. Optically active 4d was prepared from 24 by asymmetric aldol reaction using 31, which was cyclized to 3d. With further reactions, 1alpha,25-dihydroxyvitamin D3 (1a) was obtained.

  DOI：

  10.1021/jo00061a028

文献信息

• An efficient asymmetric synthesis of 1.alpha.,25-(OH)2 vitamin D3 A-ring synthon
  作者：Kazuo Nagasawa、Hideki Ishihara、Yoshiro Zako、Isao Shimizu

  DOI：10.1021/jo00061a028

  日期：1993.4

  Chiral synthesis of the A-ring synthon 3 of 1alpha,25-dihydroxyvitamin D3 (1a) based on palladium-catalyzed cyclization of 8-bromo-2,8-nonadienoates is described. Reaction of (E)-4b and (Z)-4d in the presence of Pd(OAc)2, PPh3, and K2CO3 gave (E)-3b and (Z)-3d, respectively. Optically active 4d was prepared from 24 by asymmetric aldol reaction using 31, which was cyclized to 3d. With further reactions, 1alpha,25-dihydroxyvitamin D3 (1a) was obtained.