benzyl (2R,3R,4R)-3,4-dimethoxy-2-(4-methoxybenzyl)-pyrrolidine-1-carboxylate

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: benzyl (2R,3R,4R)-3,4-dimethoxy-2-(4-methoxybenzyl)-pyrrolidine-1-carboxylate
• 英文别名: benzyl (2S,3S,4S)-3,4-dimethoxy-2-[(4-methoxyphenyl)methyl]pyrrolidine-1-carboxylate
• 化学式: C₂₂H₂₇NO₅
• 分子量: 385.46
• InChiKey: HXUXLWJZACIKRG-ACRUOGEOSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  3.2
• 重原子数：
  28
• 可旋转键数：
  8
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.41
• 拓扑面积：
  57.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  benzyl (2R,3R,4R)-3,4-dimethoxy-2-(4-methoxybenzyl)-pyrrolidine-1-carboxylate 在 palladium on activated charcoal 氢气 作用下， 以 乙醇 为溶剂， 反应 0.5h， 以77%的产率得到(2S,3S,4S)-3,4-Dimethoxy-2-(4-methoxy-benzyl)-pyrrolidine
  参考文献：
  名称：

  Exploratory Synthetic Studies of the α-Methoxylation of Amides via Cuprous Ion-Promoted Decomposition of o-Diazobenzamides

  摘要：

  A convenient nonelectrochemical amide oxidation method has been developed. The process involves a cuprous ion-promoted decomposition of o-diazobenzamides like 4, generated in situ from the corresponding o-aminobenzamides, to give N-acyliminium ion intermediate 9 via a 1,5-H-atom transfer, followed by metal-catalyzed oxidation of the resulting alpha-amidyl radical. The transformation produces alpha-methoxybenzamides 15 in good yields. An attempt was made to apply this oxidation method to a total synthesis of the alkaloid (-)-anisomycin (16). Scalemic o-aminobenzamide pyrrolidine derivatives 18a/18b underwent oxidation to give a-methoxylated amide substrates 19a/ 19b, respectively, in good yields. However, alkylation of the N-acyliminium intermediate 20 with (p-methoxybenzyl)magnesium chloride gave the undesired anti-compounds 22a/22b as the major products. The amide oxidation exhibits good regioselectivity with many unsymmetrical 2-substituted piperidine and pyrrolidine systems. In general, it appears that the larger the C-2 substituent, the greater the methylene/methine H-atom abstraction ratio. A mechanistic rationale for this selectivity is suggested based upon amide rotamer populations. An extension of this methodology can be used to conduct two sequential amide oxidations using readily prepared 2-amino-6-nitrobenzamides such as 68 and 69.

  DOI：

  10.1021/jo961529a
• 作为产物：
  描述：

  mannitol triacetonide 在 sodium tetrahydroborate 、 sodium azide 、 palladium 10% on activated carbon 、 水 、 氢气 、 碘 、 sodium hydride 、 二正丁基氧化锡 、 sodium carbonate 、 potassium carbonate 、 magnesium 、 溶剂黄146 、 过碘酸 、 三乙胺 、 三氟乙酸 作用下， 以 四氢呋喃 、 甲醇 、 乙醚 、 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 反应 68.33h， 生成 benzyl (2R,3R,4R)-3,4-dimethoxy-2-(4-methoxybenzyl)-pyrrolidine-1-carboxylate
  参考文献：
  名称：

  A facile and stereoselective synthesis of the C-2 epimer of (+)-deacetylanisomycin

  摘要：

  A short, simple and efficient synthesis of the C-2 epimer of (+)-deacetylanisomycin starting from D-mannitol, utilizing an epoxide opening with a Grignard reagent and acid catalysed unusual intramolecular 5-endo-tet cyclization as key steps has been reported. (C) 2011 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tetasy.2011.01.021

文献信息

• A facile and stereoselective synthesis of the C-2 epimer of (+)-deacetylanisomycin
  作者：K. Sridhar Reddy、B. Venkateswara Rao

  DOI：10.1016/j.tetasy.2011.01.021

  日期：2011.1

  A short, simple and efficient synthesis of the C-2 epimer of (+)-deacetylanisomycin starting from D-mannitol, utilizing an epoxide opening with a Grignard reagent and acid catalysed unusual intramolecular 5-endo-tet cyclization as key steps has been reported. (C) 2011 Elsevier Ltd. All rights reserved.
• Exploratory Synthetic Studies of the α-Methoxylation of Amides <i>via</i> Cuprous Ion-Promoted Decomposition of <i>o</i>-Diazobenzamides
  作者：Gyoonhee Han、Matthew G. LaPorte、Mathias C. McIntosh、Steven M. Weinreb、Masood Parvez

  DOI：10.1021/jo961529a

  日期：1996.1.1

  A convenient nonelectrochemical amide oxidation method has been developed. The process involves a cuprous ion-promoted decomposition of o-diazobenzamides like 4, generated in situ from the corresponding o-aminobenzamides, to give N-acyliminium ion intermediate 9 via a 1,5-H-atom transfer, followed by metal-catalyzed oxidation of the resulting alpha-amidyl radical. The transformation produces alpha-methoxybenzamides 15 in good yields. An attempt was made to apply this oxidation method to a total synthesis of the alkaloid (-)-anisomycin (16). Scalemic o-aminobenzamide pyrrolidine derivatives 18a/18b underwent oxidation to give a-methoxylated amide substrates 19a/ 19b, respectively, in good yields. However, alkylation of the N-acyliminium intermediate 20 with (p-methoxybenzyl)magnesium chloride gave the undesired anti-compounds 22a/22b as the major products. The amide oxidation exhibits good regioselectivity with many unsymmetrical 2-substituted piperidine and pyrrolidine systems. In general, it appears that the larger the C-2 substituent, the greater the methylene/methine H-atom abstraction ratio. A mechanistic rationale for this selectivity is suggested based upon amide rotamer populations. An extension of this methodology can be used to conduct two sequential amide oxidations using readily prepared 2-amino-6-nitrobenzamides such as 68 and 69.