20-deethyltubifolidine | 116787-64-5

• 英文名称: 20-deethyltubifolidine
• CAS: 116787-64-5
• 化学式: C₁₆H₂₀N₂
• 分子量: 240.348
• InChiKey: DYPSTCKEEHXBOX-RAEVTNRLSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.61
• 重原子数：
  18.0
• 可旋转键数：
  0.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.62
• 拓扑面积：
  15.27
• 氢给体数：
  1.0
• 氢受体数：
  2.0

反应信息

• 作为产物：
  描述：

  5-oxo-3-cyclohexene-1-acetonitrile 在 吡啶 、 tris-(dibenzylideneacetone)dipalladium(0) 、 palladium 10% on activated carbon 、 三氟化硼乙醚 、 氢气 、 碘 、 铜 、 sodium carbonate 、 potassium carbonate 、 对甲苯磺酸 、 2,3-二氯-5,6-二氰基-1,4-苯醌 作用下， 以 四氢呋喃 、 1,4-二氧六环 、 甲醇 、 乙醇 、 二氯甲烷 、 氯仿 、 水 、 二甲基亚砜 为溶剂， 101.0 ℃ 、101.33 kPa 条件下， 反应 88.5h， 生成 20-deethyltubifolidine
  参考文献：
  名称：

  A Raney-Cobalt-Mediated Tandem Reductive Cyclization Route to the 1,5-Methanoazocino[4,3-b]indole Framework of the Uleine and Strychnos Alkaloids

  摘要：

  The readily accessible enones 8, 17, and 18 undergo 2-fold reductive cyclization reactions upon exposure to hydrogen in the presence of Raney-cobalt and thereby afford compounds 11 (72%), 19 (47%), and 20 (84%), respectively. These products embody the ABCD-ring system associated with the title alkaloids, and compound 11 Can be converted, over four steps and in 33% yield, into congener 24 incorporating the ABCDE-ring system of the Strychnos alkaloids.

  DOI：

  10.1021/jo302132d

文献信息

• A new synthetic entry to pentacyclic Strychnos alkaloids. Total synthesis of (.+-.)-tubifolidine, (.+-.)-tubifoline, and (.+-.)-19,20-dihydroakuammicine
  作者：Mercedes Amat、Ana Linares、Joan Bosch

  DOI：10.1021/jo00313a017

  日期：1990.12

  A new strategy for the synthesis of pentacyclic Strychnos alkaloids has been developed. It consists in the closure of the five-membered E ring by cyclization upon the indole 3-position from a suitably N-substituted tetracyclic system embodying rings ABCD of the alkaloids. Attempts to effect the key cyclization either by Pummerer rearrangement of sulfinylacetamides 4 and 6, from chloroacetamide 12, or from bis(methylthio)acetamide 10b (exocyclic amide carbonyl group) resulted in failure. In the first case dithioacetals 9 and 10, respectively, were formed in good yields. Cyclization from alcohol 13 or from the indole-deactivated acetal 15 and dithiocetal 18 were also unsuccessful: noncyclized products coming from the initially formed oxonium or thionium intermediates 16 were obtained. Cyclization was satisfactorily accomplished in 49% yield by treatment of the N-unsubstituted indole dithioacetal 23 with DMTSF. The resulting pentacycle 25 was converted to 20-deethyltubifolidine (27). A similar treatment from dithioacetal 41a, prepared from the secondary amine 32a, afforded pentacycle 42a, from which the alkaloids tubifoline, tubifolidine, and 19,20-dihydroakuammicine were synthesized.