(2R)-2-<(3,4-Dimethoxybenzoyl)methyl>-N-<(4-methoxyphenyl)acetyl>piperidine | 167933-98-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (2R)-2-<(3,4-Dimethoxybenzoyl)methyl>-N-<(4-methoxyphenyl)acetyl>piperidine
• 英文别名: 1-(3,4-dimethoxyphenyl)-2-[(2R)-1-[2-(4-methoxyphenyl)acetyl]piperidin-2-yl]ethanone
• CAS: 167933-98-4
• 化学式: C₂₄H₂₉NO₅
• 分子量: 411.498
• InChiKey: VHXHRUIULAXUON-LJQANCHMSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.5
• 重原子数：
  30
• 可旋转键数：
  8
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.42
• 拓扑面积：
  65.1
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  (2R)-2-<(3,4-Dimethoxybenzoyl)methyl>-N-<(4-methoxyphenyl)acetyl>piperidine 在 三氟代氧化钒(V) 、 红铝 、 三氟乙酸酐 、 potassium hydroxide 作用下， 以 1,4-二氧六环 、 乙醇 、 二氯甲烷 、 乙酸乙酯 、 甲苯 为溶剂， 反应 3.5h， 生成 小穗苎麻素
  参考文献：
  名称：

  通过有机催化分子内 Aza-Michael 加成对映选择性合成 Cryptopleurine 和 Boehmeriasin A

  摘要：

  从市售的 Cbz 保护的 2-哌啶酮中分 8 个步骤实现菲喹唑啉生物碱隐胸苷和勃姆虫素 A 的对映选择性合成，总产率分别为 22% 和 20%。该路线的关键步骤是分子内对映选择性氮杂-迈克尔加成、分子内醛醇加成和氧化偶联。

  DOI：

  10.1055/s-0031-1290457
• 作为产物：
  描述：

  4-甲氧基苯乙酰氯 在 sodium hydroxide 、 重铬酸吡啶 、 4 A molecular sieve 作用下， 以 二氯甲烷 为溶剂， 反应 5.67h， 生成 (2R)-2-<(3,4-Dimethoxybenzoyl)methyl>-N-<(4-methoxyphenyl)acetyl>piperidine
  参考文献：
  名称：

  Asymmetric Total Synthesis of (R)-(-)-Cryptopleurine and (R)-(-)-Julandine via Highly Enantioselective Amidoalkylations with N-Acylhydrazonium Salts

  摘要：

  The first enantioselective total syntheses of the phenanthroquinolizidine alkaloid(-)-cryptopleurine (1) and its seco base (-)-julandine [(R)-3] are described. The synthesis of(R)-3 allowed the 9aS configuration to be assigned to natural dextrorotatory julandine as shown by structure (S)-3. Both synthetic approaches are based on the high degree of 1,3-asymmetric induction achieved using an N-acylhydrazonium salt, which belongs to a new structural class of activated azomethines. Upon exposure of methoxy lactam 9, with a chiral 2-substituted pyrrolidine auxiliary, to BF3 . Et(2)O and a silyl enol ether the in situ generated N-acylhydrazonium intermediate 10 underwent asymmetric nucleophilic addition to give the (GR)-keto lactams 13 and 14 with complete diastereoselectivity. On the other hand, nucleophilic addition to the N-acylhydrazonium ion 25, with an acyclic chiral auxiliary, showed poor diastereoselectivity. From these results, the high degree of diastereoselection observed for the N-acylhydrazonium ion 10 can be rationalized in terms of the pyramidal stability of the trivalent nitrogen in the chiral pyrrolidine auxiliary. Removal of the chiral auxiliary from 13 and 14 was achieved by reductive N-N bond cleavage using BH3 . THF, affording (BS)-piperidine derivatives 15 and 31, respectively, which were transformed into quinolizidinones 30 and 35, respectively, via intramolecular aldol condensation. Reduction of 30 with alane provided (-)julandine [(R)-3]. In addition, 35 was converted to (-)-cryptopleurine (1) in two steps, by radical cyclization with Bu(3)SnH and AIBN, followed by LiAlH4 reduction.

  DOI：

  10.1021/jo00124a025

文献信息

• Enantioselective Synthesis of Cryptopleurine and Boehmeriasin A via ­Organocatalytic Intramolecular Aza-Michael Addition
  作者：Shouyun Yu、Chuanqi Zeng、Hanbin Liu、Mengyao Zhang、Jiajia Guo、Shunchao Jiang

  DOI：10.1055/s-0031-1290457

  日期：——

  The enantioselective synthesis of phenanthroquinolizidine alkaloids cryptopleurine and boehmeriasin A was achieved in eight steps from commercial available Cbz-protected 2-piperidinone in 22% and 20% overall yield, respectively. The key steps of this route are intramolecular enantioselective aza-Michael addition, intramolecular aldol addition, and oxidative coupling.

  从市售的 Cbz 保护的 2-哌啶酮中分 8 个步骤实现菲喹唑啉生物碱隐胸苷和勃姆虫素 A 的对映选择性合成，总产率分别为 22% 和 20%。该路线的关键步骤是分子内对映选择性氮杂-迈克尔加成、分子内醛醇加成和氧化偶联。
• Asymmetric Total Synthesis of (R)-(-)-Cryptopleurine and (R)-(-)-Julandine via Highly Enantioselective Amidoalkylations with N-Acylhydrazonium Salts
  作者：Hideaki Suzuki、Sakae Aoyagi、Chihiro Kibayashi

  DOI：10.1021/jo00124a025

  日期：1995.9

  The first enantioselective total syntheses of the phenanthroquinolizidine alkaloid(-)-cryptopleurine (1) and its seco base (-)-julandine [(R)-3] are described. The synthesis of(R)-3 allowed the 9aS configuration to be assigned to natural dextrorotatory julandine as shown by structure (S)-3. Both synthetic approaches are based on the high degree of 1,3-asymmetric induction achieved using an N-acylhydrazonium salt, which belongs to a new structural class of activated azomethines. Upon exposure of methoxy lactam 9, with a chiral 2-substituted pyrrolidine auxiliary, to BF3 . Et(2)O and a silyl enol ether the in situ generated N-acylhydrazonium intermediate 10 underwent asymmetric nucleophilic addition to give the (GR)-keto lactams 13 and 14 with complete diastereoselectivity. On the other hand, nucleophilic addition to the N-acylhydrazonium ion 25, with an acyclic chiral auxiliary, showed poor diastereoselectivity. From these results, the high degree of diastereoselection observed for the N-acylhydrazonium ion 10 can be rationalized in terms of the pyramidal stability of the trivalent nitrogen in the chiral pyrrolidine auxiliary. Removal of the chiral auxiliary from 13 and 14 was achieved by reductive N-N bond cleavage using BH3 . THF, affording (BS)-piperidine derivatives 15 and 31, respectively, which were transformed into quinolizidinones 30 and 35, respectively, via intramolecular aldol condensation. Reduction of 30 with alane provided (-)julandine [(R)-3]. In addition, 35 was converted to (-)-cryptopleurine (1) in two steps, by radical cyclization with Bu(3)SnH and AIBN, followed by LiAlH4 reduction.