3-(4-methoxyphenyl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 唑类
• 英文名称: 3-(4-methoxyphenyl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole
• 化学式: C₁₃H₁₄N₂O
• 分子量: 214.267
• InChiKey: IRSHDNKVZGCDJZ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.2
• 重原子数：
  16
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.31
• 拓扑面积：
  27
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  5-allyl-4-hydroxy-1-trityl-1H-pyrazole 在 盐酸 、 甲基三辛基氯化铵 、 sodium carbonate 、 三乙胺 、 9-硼双环[3.3.1]壬烷 、 bis(dibenzylideneacetone)-palladium⁽⁰⁾ 、 三环己基膦 作用下， 以 四氢呋喃 、 乙二醇二甲醚 、 乙醇 、 二氯甲烷 、 水 为溶剂， 反应 65.0h， 生成 3-(4-methoxyphenyl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole
  参考文献：
  名称：

  Divergent Synthesis and Evaluation of Inhibitory Activities against Cyclooxygenases-1 and -2 of Natural Withasomnines and Analogues

  摘要：

  通过4-羟基吡唑的途径，实现了自然界存在的吲哚啉类化合物及其类似物的多样性合成。该合成方法是通过4-醛基吡唑的Baeyer-Villiger氧化产物经碱性水解制备4-羟基吡唑。合成过程中的关键步骤包括：4-烯丙氧基吡唑的选择性Claisen重排反应，以及5,6-二氢-4H-吡咯[1,2-b]吡唑-3-基三氟甲磺酸酯与市售的芳基硼酸的Suzuki-Miyaura耦合反应。该策略最后一步的Suzuki-Miyaura耦合反应使得自然界存在的吲哚啉类化合物及其类似物的便捷制备成为可能。评估了合成的十二种化合物对环氧合酶-1和-2（COX-1和COX-2）的生物活性。

  DOI：

  10.1248/cpb.c12-00725

文献信息

• A divergent strategy to the withasomnines
  作者：Robert S. Foster、Jianhui Huang、Jérôme F. Vivat、Duncan L. Browne、Joseph P. A. Harrity

  DOI：10.1039/b910632d

  日期：——

  A concise synthesis of three members of the withasomnine family of natural products is reported. The synthesis features a regioselective sydnone–alkynylboronate cycloaddition followed by Suzuki cross coupling and silyl group removal, and marks the first divergent approach to this family of pyrazole based natural products.

  报道了一种简明的合成方法，用于三种与阿魏酰胺家族的天然产物。该合成特点是区域选择性的辛多烯-炔基硼酸酯环加成，随后进行铃木交叉耦合和硅基团去除，标志着首次对这一类基于吡唑的天然产物进行的多样化合成方法。
• Synthesis of Withasomnines and Their Non-natural Analogues from Aldehydes and 4-Nitro-1-butanol in Three Steps
  作者：Deepti Verma、Rahul Kumar、Irishi N. N. Namboothiri

  DOI：10.1021/jo400207u

  日期：2013.4.5

  Total synthesis of all three pyrazole-based withasomnine alkaloids and selected examples of their non-natural analogs has been achieved from readily available aldehydes and 4-nitro-1-butanol in three steps. Since 4-nitro-1-butanol in turn is prepared in two steps via Michael addition of nitromethane to acrylate followed by borane reduction of the ester group and the key 1,3-dipolar cycloaddition step

  通过三个步骤，从容易获得的醛和4-硝基-1-丁醇中已经实现了所有三种吡唑基含天冬氨酸生物碱的全合成及其非天然类似物的选定实例。因为依次通过两步制备4-硝基-1-丁醇，方法是将硝基甲烷迈克尔加成至丙烯酸酯，然后硼烷还原酯基，并且关键的1,3-偶极环加成步骤是使用市售的TMSCHN 2进行的，因此该方法是一种非常方便且经济的方法。
• Synthesis of 5,6-Dihydro-4H-pyrrolo[1,2-b]pyrazoles and Homologs from 5-Substituted 2-(Alkynyl)tetrazoles via Microwave-Induced Intramolecular Nitrile-Imine–Alkyne 1,3-Dipolar Cycloaddition
  作者：Yoshihide Usami、Hiroki Yoneyama、Mano Adachi、Aoshi Morita、Maki Nakagawa、Miho Baba、Kanako Yamawaki、Noboru Hayama、Shinya Harusawa

  DOI：10.1055/a-1961-8504

  日期：2023.3

  Microwave irradiation of 2-alkynyl-5-(phenyl or alkyl)tetrazoles affords 2-(phenyl or alkyl)-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazoles via intramolecular [3+2] cyclization of nitrile-imine intermediates. In the present method, the use of 5-alkyltetrazoles as the starting materials is more advantageous because of the difficulties associated with conventional photoreactions. From 2-phenylalkynyl-5-methylthio-1H-tetrazoles, the reaction efficiently produces 2-methylthio-3-phenyl-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazoles. The procedure using the methylthio group is applied to the total synthesis of three naturally occurring withasomnines. The method is also extended to the construction of molecules in which bicyclic pyrazoles are fused to six- to eight-membered rings.

  摘要：使用微波辐照2-炔基-5-(苯基或烷基)四唑，通过腈-亚胺中间体的分子内[3+2]环化，得到2-(苯基或烷基)-5,6-二氢-4H-吡咯并[1,2-b]吡嗪。在本方法中，使用5-烷基四唑作为起始物质更具优势，因为传统光反应存在困难。从2-苯基炔基-5-甲硫基-1H-四唑，该反应有效地产生2-甲硫基-3-苯基-5,6-二氢-4H-吡咯并[1,2-b]吡嗪。使用甲硫基团的程序应用于三种天然存在的威莎莫宁的全合成。该方法还扩展到将双环吡嗪融合到六到八元环中构建分子。
• Divergent synthesis of withasomnines via synthesis of 4-hydroxy-1H-pyrazoles and Claisen rearrangement of their 4-O-allylethers
  作者：Hayato Ichikawa、Ryo Watanabe、Yuiko Fujino、Yoshihide Usami

  DOI：10.1016/j.tetlet.2011.06.061

  日期：2011.8

  4-Hydroxypyrazoles were synthesized by the alkaline hydrolysis of the Baeyer-Villiger oxidation products of 4-formylpyrazoles. This new synthesis of 4-hydroxypyrazoles was applied to the divergent synthesis of withasomnine alkaloids in a unique strategy, for which the key steps included the regioselective Claisen rearrangement of their 4-O-allyl-4-hydroxy-1H-pyrazoles and a Suzuki coupling of 4-trifluoromethanesulfonyloxy-1H-pyrazoles and arylboronic acids. (C) 2011 Elsevier Ltd. All rights reserved.