methyl 18-hydroxy-2β,16α-cur-19-en-17-oate | 112791-25-0

• 分子结构分类: 有机化合物 - 生物碱及其衍生物 - 马钱子生物碱
• 英文名称: methyl 18-hydroxy-2β,16α-cur-19-en-17-oate
• 英文别名: methyl 18-hydroxy-2β-16β-cur-19-en-17-oate；methyl (3aS,5R,6S,6aS,11bS,E)-12-(2-hydroxyethylidene)-1,2,3a,4,5,6,6a,7-octahydro-3,5-ethanopyrrolo[2,3-d]carbazole-6-carboxylate；methyl (1S,9S,10S,11R,12E,17S)-12-(2-hydroxyethylidene)-8,14-diazapentacyclo[9.5.2.01,9.02,7.014,17]octadeca-2,4,6-triene-10-carboxylate
• CAS: 112791-25-0
• 化学式: C₂₀H₂₄N₂O₃
• 分子量: 340.422
• InChiKey: VKBJWCYTAAIDMB-AJLZUVBKSA-N

物化性质

• 沸点：
  526.3±50.0 °C(Predicted)
• 密度：
  1.33±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.1
• 重原子数：
  25
• 可旋转键数：
  3
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.55
• 拓扑面积：
  61.8
• 氢给体数：
  2
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  methyl 18-hydroxy-2β,16α-cur-19-en-17-oate 在 sodium acetate 、 乙酸酐 、 二异丁基氢化铝 、 溶剂黄146 作用下， 以 正己烷 、 二氯甲烷 为溶剂， 反应 4.0h， 生成 番木鳖碱
  参考文献：
  名称：

  通过区域和立体控制的合作催化下的马钱子和白屈菜碱生物碱的对映选择性合成。

  摘要：

  我们描述的对映选择性合成马钱子和白屈菜生物碱。在第一种情况下，吲哚乙酸酯被确定为对映选择性协同异硫脲/ Pd催化α-烷基化的优秀伴侣亲核试剂。这提供了以高收率和出色的对映体诱导水平包含吲哚的立构中心的产品，其方式明显独立于N取代基。这导致了（−）‐ akuammicine和（−）‐ strychnine的简明合成。在第二种情况下，邻位表现不佳对映选择性协同异硫脲/ Ir催化的α-烷基化反应中的预取代肉桂酸亲电试剂可通过适当的取代基选择来克服，从而导致（+）-螯合碱，（+）-去甲螯合碱和（+）-螯合胺的对映选择性合成。

  DOI：

  10.1002/anie.202005151
• 作为产物：
  描述：

  1,3,5-三嗪-2(1H)-酮,四氢-5-(2-碘苯基)-1,3-二甲基- 在 N-甲基吡咯烷酮 、 盐酸 、 叔丁基过氧化氢 、 氢氧化钾 、 tris-(dibenzylideneacetone)dipalladium(0) 、 三苯胂 、 硫酸 、 四丁基氟化铵 、 苄基三甲基氢氧化铵 、 sodium hydride 、 甲基磺酰氯 、 sodium sulfate 、 N,N-二异丙基乙胺 、 lithium chloride 、 锌 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲醇 、 乙醇 、 乙腈 、 苯 为溶剂， -78.0~100.0 ℃ 、344.73 kPa 条件下， 反应 2.0h， 生成 methyl 18-hydroxy-2β,16α-cur-19-en-17-oate
  参考文献：
  名称：

  Synthesis applications of cationic aza-Cope rearrangements. 26. Enantioselective total synthesis of (-)-strychnine

  摘要：

  DOI：

  10.1021/ja00073a057

文献信息

• Enantioselective Total Synthesis of Wieland-Gumlich Aldehyde and (−)-Strychnine
  作者：Daniel Solé、Josep Bonjoch、Silvina García-Rubio、Emma Peidró、Joan Bosch

  DOI：10.1002/(sici)1521-3765(20000218)6:4<655::aid-chem655>3.0.co;2-6

  日期：2000.2.18

  A total synthesis of (-)-strychnine in 15 steps from 1,3-cyclohexanedione in 0.15% overall yield is described. The sequence followed in the assembling of rings is: E-->AE [2-(2-nitrophenyl)-1,3-cyclohexanedione]-->ACE (3a-aryloctahydroindol-4-one)-->ACDE (arylazatricyclic core)-->ABCDE (strychnan skeleton)-->ABCDEF (Wieland-Gumlich aldehyde)-->ABCDEFG (strychnine). The key steps of the synthesis are

  描述了由1,3-环己二酮以0.15％的总收率分15步合成（-）-士的宁。组装环后的顺序是：E-> AE [2-（2-硝基苯基）-1,3-环己二酮]-> ACE（3a-芳基氢化吲哚-4-酮）-> ACDE（芳基三环核心） ）-> ABCDE（Strychnan骨架）-> ABCDEF（Wieland-Gumlich醛）-> ABCDEFG（Strychnine）。合成的关键步骤是3a-（2-硝基苯基）-八氢吲哚-4-酮环系统的对映选择性结构，以及通过还原性Heck环化反应生成关键中间体（-）-14闭合哌啶环。相反，路易斯酸促进的α-烷氧基炔丙基硅烷-烯酮环化没有导致合成上有用的氮杂三环ACDE中间体。
• Syntheses of Strychnan- and Aspidospermatan-Type Alkaloids. 10. An Enantioselective Synthesis of (−)-Strychnine through the Wieland−Gumlich Aldehyde
  作者：Martin E. Kuehne、Feng Xu

  DOI：10.1021/jo9813989

  日期：1998.12.1

  Condensations of L-tryptophan-derived 2-[(methoxycarbonyl)methyl]-3-[2(S)-(benzyloxycarbonyl)- 2-(N-b-benzylamino)ethyl]indole (6) with 4,4-dimethoxyacrolein or with 2,4-hexadienal, followed by removal of the tryptophanyl ester function, respectively gave the tetracyclic acetal (-)-methyl (2S, 3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(dimethoxymethyl)-1H-pyrrolo[2,3-d]carbazole-6-carboxylate (10) or the tetracyclic olefin (-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(1-propenyl)-1H-pyrrolo[2,3-d]carbazole-6-carboxylate (14). Their respective hydrolysis or oxidation provided, enantioselectively, the tetracyclic aldehyde (-)-methyl (2S,3aS,5R,11bR)3-benzyl-2,3,3a,4,5,7-hexahydro-5-formyl-1H-pyrrolo[2,3-d]carbazole-6-carboxylate (5). Its reaction with tri-n-butyl-1-(ethoxy)ethoxymethyltin and n-butyllithium, followed by oxidation of the resultant alcohol (-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(1 xi-hydroxy-2-((1-ethoxy-ethoxy))ethyl-1H-pyrrolo[2,3-d]carbazole-6-carboxylate (16) and cyclization furnished the pentacyclic ketone (-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahydro-3,5-ethano-12-oxo-1H-pyrrolo-2,3-d]carbazole-6-carboxylate (15). A Horner-Emmons condensation led to the unsaturated esters (-)-methyl (2S,3aS,5R,11bR)-3-benzyl-2,3,3a,4,5,7-hexahodro-3,5-ethano-12-(E and Z)-[(methoxycarbonyl)-methylene]-1H-pyrrolo[2,3-d]carbazole-6-carboxylates(19 and 20) with 17:1 E/Z selectivity. Reductions of the ester and vinylogous urethane functions in 19 led to the Wieland-Gumlich aldehyde 3 as a 6:1 anomeric hemiacetal mixture. Its condensation with malonic acid provided (-)-strychnine (1) in 5.3% overall yield and 14 steps from the tryptophan derivative 6.
• Asymmetric Total Syntheses of (-)- and (+)-Strychnine and the Wieland-Gumlich Aldehyde
  作者：Steven D. Knight、Larry E. Overman、Garry Pairaudeau

  DOI：10.1021/ja00126a017

  日期：1995.5

  The first asymmetric total syntheses of (-)-strychnine, ent-strychnine, and the Wieland-Gumlich aldehyde are described with full experimental details. The total synthesis of (-)-strychnine was realized in 24 steps and 3% overall yield from (1R,4S)-(+)-4-hydroxy-2-cyclopentenyl acetate (28). This synthesis fully controls the six stereogenic centers and forms the C(20) double bond of (-)-strychnine with high diastereoselection (>20:1). In the first stage of the synthesis, the (R)-cyclopentenylstannane 8 is prepared in nine steps and 30% overall yield (40% with one recycle of 38) as summarized in Scheme 4. Palladium-catalyzed carbonylative coupling of 8 with the 2-iodoaniline derivative 7 provides enone 6, which is converted to the 2-azabicyclo[3.2.1]octane 5 in seven additional steps. This latter sequence proceeds in 36% overall yield (Scheme 6). The central step of the total synthesis is aza-Cope-Mannich rearrangement of 5 which proceeds in 98% yield to form the pentacyclic intermediate 4 (Scheme 7). In five additional steps 4 is converted to the Wieland-Gumlich aldehyde 2, which is the ultimate precursor of (-)strychnine. A slight modification of this synthesis strategy allowed ent-strychnine to be prepared and provided the first samples of this unnatural enantiomer for pharmacological studies (Scheme 8). The efficiency and conciseness of this synthesis provide an important benchmark of the power of the aza-Cope rearrangement-Mannich reaction to solve formidable problems in alkaloid construction.