Isosetoclavin | 519-11-9

• 分子结构分类: 有机化合物 - 生物碱及其衍生物 - 麦角林及其衍生物
• 英文名称: Isosetoclavin
• 英文别名: (6aR,9R)-7,9-dimethyl-4,6,6a,8-tetrahydroindolo[4,3-fg]quinolin-9-ol
• CAS: 519-11-9
• 化学式: C₁₆H₁₈N₂O
• 分子量: 254.332
• InChiKey: BGVUWLLRNRBDAY-GDBMZVCRSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  19
• 可旋转键数：
  0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.38
• 拓扑面积：
  39.3
• 氢给体数：
  2
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  甲基锂 、 (+)-9,10-didehydro-6-methylergoline-8-one 以 四氢呋喃 、 苯甲醚 为溶剂， 反应 1.0h， 以38%的产率得到Isosetoclavin
  参考文献：
  名称：

  New Routes to Clavine-type Ergot Alkaloids. Part 1. First Total Synthesis of Three Natural Products: (+)-Setoclavine, (+)-Isosetoclavine, (-)-9,10-Dihydroisosetoclavine, and Structure Correction of the Latter

  摘要：

  The double bond in ring D of (+)-9,10-didehydro-6-methylergolin-8-one (2) was reduced selectively by catalytic hydrogenation to yield (-)-6-methylergolin-8-one (6). Grignard reaction of 6 has been performed with methylmagnesium iodide to afford two isomers (5 and 7). The main isomer having an 8 alpha-methyl group at C8 with a C/D-trans junction (5; (-)-dihydroisosetoclavine) proved to be identical with the natural product, hence its name and structure should be corrected. As a minor isomer (7) a C/D-cis clavine derivative was also isolated which can be regarded as unnatural (+)-8 alpha-hydroxy-costaclavine. (+)-Setoclavine (8) and (+)-isosetoclavine (9) have also been prepared from 2, thus achieving the first total synthesis of these natural products. Detailed structure elucidation of 5-9 has been carried out as well.

  DOI：

  10.3987/com-05-s(t)26

文献信息

• New Routes to Clavine-type Ergot Alkaloids. Part 1. First Total Synthesis of Three Natural Products: (+)-Setoclavine, (+)-Isosetoclavine, (-)-9,10-Dihydroisosetoclavine, and Structure Correction of the Latter
  作者：István Moldvai、Eszter Temesvári-Major、Eszter Gács-Baitz、Mária Incze、Gábor Dörnyei、Csaba Szántay

  DOI：10.3987/com-05-s(t)26

  日期：——

  The double bond in ring D of (+)-9,10-didehydro-6-methylergolin-8-one (2) was reduced selectively by catalytic hydrogenation to yield (-)-6-methylergolin-8-one (6). Grignard reaction of 6 has been performed with methylmagnesium iodide to afford two isomers (5 and 7). The main isomer having an 8 alpha-methyl group at C8 with a C/D-trans junction (5; (-)-dihydroisosetoclavine) proved to be identical with the natural product, hence its name and structure should be corrected. As a minor isomer (7) a C/D-cis clavine derivative was also isolated which can be regarded as unnatural (+)-8 alpha-hydroxy-costaclavine. (+)-Setoclavine (8) and (+)-isosetoclavine (9) have also been prepared from 2, thus achieving the first total synthesis of these natural products. Detailed structure elucidation of 5-9 has been carried out as well.