(+)-lepadin D

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 喹啉类
• 英文名称: (+)-lepadin D
• 英文别名: lepadin D；(2S,3R,4aS,5S,8aR)-5-[(5R)-5-hydroxyoctyl]-2-methyl-1,2,3,4,4a,5,6,7,8,8a-decahydroquinolin-3-ol
• 化学式: C₁₈H₃₅NO₂
• 分子量: 297.481
• InChiKey: LNSIIDDYOVTXHK-KHHDSSOXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.8
• 重原子数：
  21
• 可旋转键数：
  7
• 环数：
  2.0
• sp3杂化的碳原子比例：
  1.0
• 拓扑面积：
  52.5
• 氢给体数：
  3
• 氢受体数：
  3

反应信息

• 作为产物：
  描述：

  (R)-(-)-hexane-1,3-diol 在 palladium on activated charcoal 盐酸 、 三丁基膦 、 四丁基氟化铵 、 氢气 、 sodium hexamethyldisilazane 、 碳酸氢钠 、 N,N-二异丙基乙胺 、 间氯过氧苯甲酸 、 偶氮二甲酸二乙酯 作用下， 以 四氢呋喃 、 甲醇 为溶剂， 反应 86.5h， 生成 (+)-lepadin D
  参考文献：
  名称：

  Facile Entry to Substituted Decahydroquinoline Alkaloids. Total Synthesis of Lepadins A−E and H

  摘要：

  Condensation of a L-alanine derived delta-bromo-beta-silyloxy-propylamine with 1,3-cyclohexadione followed by alkylative cyclization produces a bicyclic enone. Diastereoselective Pt/C-catalyzed hydrogenation of this enone in HOAc provides a 5-oxo-cis-fused decahydroquinoline. Wittig olefination of this decahydroquinoline and subsequent epimerization of the resulting 5-formyl intermediate gives rise to a 5-beta-formyl decahydroquinoline exclusively. In a parallel procedure, Peterson reaction of this decahydroquinoline and subsequent hydrogenation of the generated 5-exo-olefin provides a decahydroquinoline with a 5-alpha-substituent predominantly. For these two diastereoselective processes, using the intermediates without N-protection as the substrates is essential because the corresponding N-Boc intermediates give poor diastereoselectivity. The intermediate with beta-form side chain is further converted into lepadins A-C via carbon chain elongation, while the intermediate with alpha-form side chain is transformed into lepadins D, E, and H and corresponding 5'-epimers via connection with two sulfones generated from two Sharpless epoxidation products. By comparison of the rotations and NMR data, the stereochemistry of lepadins D, E, and H is assigned as 2S, 3R, 4aS, 5S, 8aR, 5'R.

  DOI：

  10.1021/jo061070c

文献信息

• Enantioselective Synthesis of Lepadins A-D from a Phenylglycinol-Derived Hydroquinolone Lactam
  作者：Mercedes Amat、Alexandre Pinto、Rosa Griera、Joan Bosch

  DOI：10.1002/chem.201501909

  日期：2015.9.1

  The marine alkaloids (−)‐lepadins A–C and (+)‐lepadin D, belonging to two diastereoisomeric series, were synthesized from an (R)‐phenylglycinol‐derived tricyclic lactam via a common cis‐decahydroquinoline intermediate. Crucial aspects of the synthesis are the stereochemical control in the assembly of the cis‐decahydroquinoline platform, in the introduction of the C2 methyl and C3 hydroxy substituents

  属于两个非对映异构系列的海洋生物碱（-）-lepadins A-C和（+）-lepadin D是由（R）-苯甘氨醇衍生的三环内酰胺通过一种常见的顺式-十氢喹啉中间体合成的。合成的关键方面是在顺式十氢喹啉平台的组装，C2甲基和C3羟基取代基的引入以及C5立体中心的生成中的立体化学控制。
• A Flexible Approach to the Synthesis of Type II and III Lepadin Alkaloids
  作者：Xiaochuan Chen、Yue Hu、He Gu、Yuanliang Jia、Guiyin Luo

  DOI：10.1055/a-1681-4067

  日期：2022.3

  A flexible approach to both type II and III lepadin alkaloids is developed for the first time. A key Diels–Alder reaction based on a novel chiral ketolactone dienophile is employed to obtain the desirable all-cis-trisubstituted cyclohexene with excellent regio- and stereoselectivity. As the subsequent closure of the piperidine ring is devised at the N1 and C2 position via an intramolecular nucleophilic

  首次开发了针对 II 型和 III 型lepadin 生物碱的灵活方法。采用基于新型手性酮内酯亲二烯体的关键 Diels-Alder 反应来获得具有优异区域和立体选择性的理想全顺式三取代环己烯。由于哌啶环的后续闭合是通过分子内亲核胺化在 N1 和 C2 位置设计的，因此可以从常见的中间体方便地获得在 C2 处具有相反构型的两种立体化学类型的 lepadin 框架。通过该方法，lepadins D、E（II 型）和 F（III 型）是由 L-乳酸乙酯立体选择性合成的。
• Total Synthesis of Lepadins B, D, E, and H; Determination of the Configuration of the Latter Three Alkaloids
  作者：Xiaotao Pu、Dawei Ma

  DOI：10.1002/anie.200460128

  日期：2004.8.13
• Facile Entry to Substituted Decahydroquinoline Alkaloids. Total Synthesis of Lepadins A−E and H
  作者：Xiaotao Pu、Dawei Ma

  DOI：10.1021/jo061070c

  日期：2006.8.1

  Condensation of a L-alanine derived delta-bromo-beta-silyloxy-propylamine with 1,3-cyclohexadione followed by alkylative cyclization produces a bicyclic enone. Diastereoselective Pt/C-catalyzed hydrogenation of this enone in HOAc provides a 5-oxo-cis-fused decahydroquinoline. Wittig olefination of this decahydroquinoline and subsequent epimerization of the resulting 5-formyl intermediate gives rise to a 5-beta-formyl decahydroquinoline exclusively. In a parallel procedure, Peterson reaction of this decahydroquinoline and subsequent hydrogenation of the generated 5-exo-olefin provides a decahydroquinoline with a 5-alpha-substituent predominantly. For these two diastereoselective processes, using the intermediates without N-protection as the substrates is essential because the corresponding N-Boc intermediates give poor diastereoselectivity. The intermediate with beta-form side chain is further converted into lepadins A-C via carbon chain elongation, while the intermediate with alpha-form side chain is transformed into lepadins D, E, and H and corresponding 5'-epimers via connection with two sulfones generated from two Sharpless epoxidation products. By comparison of the rotations and NMR data, the stereochemistry of lepadins D, E, and H is assigned as 2S, 3R, 4aS, 5S, 8aR, 5'R.