N-methylamide of leucic acid | 171204-80-1

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: N-methylamide of leucic acid
• 英文别名: (2S)-2-hydroxy-N,4-dimethylpentanamide
• CAS: 171204-80-1
• 化学式: C₇H₁₅NO₂
• 分子量: 145.202
• InChiKey: HVMIBGHNZSBJFH-LURJTMIESA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.6
• 重原子数：
  10
• 可旋转键数：
  3
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  49.3
• 氢给体数：
  2
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  聚合甲醛 、 N-methylamide of leucic acid 在 对甲苯磺酸 作用下， 以 苯 为溶剂， 反应 6.0h， 生成 (5S)-5-isobutyl-3-methyl-4-oxazolidinone
  参考文献：
  名称：

  内酯和内酰胺的旋光活性-II：4-恶唑烷酮的手性

  摘要：

  从相应的α-羟基酸的酰胺或N-甲基酰胺获得几种旋光的4-恶唑烷酮。研究了溶剂和取代基对其CD的影响。对于这些化合物，确立了包膜构型的优势，通过极性溶剂提高了起皱的程度。对于5-苄基取代的恶唑烷酮衍生物，观察到具有芳环面对恶唑烷酮环的折叠形式。

  DOI：

  10.1016/s0040-4020(01)91556-x
• 作为产物：
  描述：

  cryptophycin-16 在 potassium carbonate 作用下， 以 乙二醇二甲醚 、 水 、 丙酮 为溶剂， 反应 64.0h， 生成 N-methylamide of leucic acid
  参考文献：
  名称：

  Structure determination, conformational analysis, chemical stability studies, and antitumor evaluation of the cryptophycins. Isolation of 18 new analogs from Nostoc sp. strain GSV 224

  摘要：

  Using a modified isolation procedure devoid of methanol, 18 new cyclic cryptophycins have been isolated from Nostoc sp. GSV 224 as minor constituents in addition to cryptophycins-1 (A), -2 (B), -3 (C), and -4 (D). Acyclic cryptophycins are not found, indicating that the previously reported cryptophycins-5 (E methyl ester), -6 (F methyl ester), and -7 (G) are artifacts produced as a consequence of using methanol in the isolation scheme. Seventeen of the new cyclic analogs differ in structure in either one of the two hydroxy acid units, viz. unit A [(5S,6S,7R,8R)-7,8-epoxy-5-hydroxy-6-methyl-8-phenyl-2(E)-octenoic acid for cryptophycin-1 or (5S,6S)-5-hydroxy-6-methyl-8-phenyl-2(E),7(E)-octadienoic acid for cryptophycin-3] and unit D [(2S)-2-hydroxy-4-methylvaleric acid], or one of the two amino acid units, viz. unit B [(2R)-2-amino-3-(3-chloro-4-methoxyphenyl)propionic acid] and unit C [(2R)3-amino-2-methylpropionic acid], found in the cyclic ABCD peptolide. In unit A of cryptophycins-26, -28, -30, and -40, the methyl group on C-6 is missing or the Delta(2)-double bond is hydrated. In unit B of cryptophycins-16, -17, -23, 31, -43, and -45, the aromatic ring is phenolic and/or possesses two or zero chlorines. In unit C of cryptophycins-21 and -29, the methyl group on C-2 is missing. In unit D of cryptophycins-18, -19, -49, -50, and -54, a different alkyl group (propyl, isopropyl, or sec-butyl) is attached to C-2. Only one of the new analogs, cryptophycin-24, differs in structure for two units by lacking chlorine in unit B and the methyl group in unit C. Revised structures are presented for cryptophycins-5, -6, and -7 and are correlated with cryptophycin-3, the relative stereochemistry of which has been further rigorously established by X-ray crystallography. NOE studies show that the preferred conformations of most cryptophycins in solution differ from the conformation of cryptophycin-3 in the crystal state. Although cryptophycin-1 is relatively stable at pH 7, both in ionic and nonionic media, the ester bond linking units C and D is fairly labile to solvolysis and mild base hydrolysis. Structure-activity relationship studies indicate that the intact macrolide ring, the epoxide group, the chloro and 0-methyl groups in unit B, and the methyl group in unit C are needed for the in vivo activity of cryptophycin-1.

  DOI：

  10.1021/ja00154a002

文献信息

• POLONSKI, T., TETRAHEDRON, 1983, 39, N 19, 3139-3143
  作者：POLONSKI, T.

  DOI：——

  日期：——