2-methoxy-2H-1,4-benzoxazin-3(4H)-one | 147802-10-6

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并恶嗪类
• 英文名称: 2-methoxy-2H-1,4-benzoxazin-3(4H)-one
• 英文别名: 2-methoxy-4H-1,4-benzoxazin-3-one
• CAS: 147802-10-6
• 化学式: C₉H₉NO₃
• 分子量: 179.175
• InChiKey: VITZGXOFARHCTI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.9
• 重原子数：
  13
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.22
• 拓扑面积：
  47.6
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  2-methoxy-2H-1,4-benzoxazin-3(4H)-one 在 三氯化硼 、 silver carbonate 作用下， 生成 2-羟基-4H-[1,4]苯并恶嗪-3-酮
  参考文献：
  名称：

  Analogs of the cyclic hydroxamic acid 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3-one (DIMBOA): decomposition to benzoxazolinones and reaction with .beta.-mercaptoethanol

  摘要：

  Analogues of the aglucones of naturally occurring cyclic hydroxamic acids (2,4-dihydroxy-1,4-benzoxazin-3-ones) from Gramineae (Poaceae) have been synthesized by the reductive cyclization of the ring-substituted methyl alpha-(o-nitrophenoxy)-alpha-methoxyacetates, followed by demethylation of the C-2 methoxy group with BBr3 or BCl3 to reveal the 2-hydroxy group. A structure-activity series was produced by varying the substituent at C-7 on the aromatic ring [R = MeO (1), t-Bu (6), Me (7), H (8), Cl (9), F (10), CO2Me (11a)]. The pK(a) values for the hydroxamic acid and the phenol moieties were determined for each member of the C-7 series. They correlated well with sigma in a linear free energy relationship (LFER) yielding values of rho = 0.71 (with sigma-p) for pK(a1) (the hydroxamic acid) and rho = 1.6 (with sigma-m) for pK(a2) (the phenol). A LFER also existed between the rate constants for the unimolecular decomposition of these hydroxamic acids to benzoxazolinones and sigma+ (rho = 1.1). The rates of hydroxamic acid reduction to lactams by beta-mercaptoethanol were also investigated. It was found that only compounds with electron-rich aromatic rings and specifically an oxa functionality para to the hydroxamic acid nitrogen atom (compounds 1 and 3-5) had measurable rates of reduction. H-1 NMR spectra recorded during this reaction in D2O buffers (pD9), however, showed that compounds 1, 2, 6-9 (the only ones investigated) formed a hemithioacetal at C-2 even though only 1 has a measurable rate of reduction by the same thiol. The remarkable rate enhancement provided by an oxa functionality suggests that reduction occurs by direct attack of thiolate on the hydroxamic nitrogen of a resonance-stabilized ion pair.

  DOI：

  10.1021/jo00005a025
• 作为产物：
  描述：

  methyl α-(2-nitrophenoxy)-α-methoxyacetate 在 palladium on activated charcoal 氢气 作用下， 以 乙酸乙酯 为溶剂， 反应 6.0h， 以52%的产率得到2-methoxy-2H-1,4-benzoxazin-3(4H)-one
  参考文献：
  名称：

  Analogs of the cyclic hydroxamic acid 2,4-dihydroxy-7-methoxy-2H-1,4-benzoxazin-3-one (DIMBOA): decomposition to benzoxazolinones and reaction with .beta.-mercaptoethanol

  摘要：

  Analogues of the aglucones of naturally occurring cyclic hydroxamic acids (2,4-dihydroxy-1,4-benzoxazin-3-ones) from Gramineae (Poaceae) have been synthesized by the reductive cyclization of the ring-substituted methyl alpha-(o-nitrophenoxy)-alpha-methoxyacetates, followed by demethylation of the C-2 methoxy group with BBr3 or BCl3 to reveal the 2-hydroxy group. A structure-activity series was produced by varying the substituent at C-7 on the aromatic ring [R = MeO (1), t-Bu (6), Me (7), H (8), Cl (9), F (10), CO2Me (11a)]. The pK(a) values for the hydroxamic acid and the phenol moieties were determined for each member of the C-7 series. They correlated well with sigma in a linear free energy relationship (LFER) yielding values of rho = 0.71 (with sigma-p) for pK(a1) (the hydroxamic acid) and rho = 1.6 (with sigma-m) for pK(a2) (the phenol). A LFER also existed between the rate constants for the unimolecular decomposition of these hydroxamic acids to benzoxazolinones and sigma+ (rho = 1.1). The rates of hydroxamic acid reduction to lactams by beta-mercaptoethanol were also investigated. It was found that only compounds with electron-rich aromatic rings and specifically an oxa functionality para to the hydroxamic acid nitrogen atom (compounds 1 and 3-5) had measurable rates of reduction. H-1 NMR spectra recorded during this reaction in D2O buffers (pD9), however, showed that compounds 1, 2, 6-9 (the only ones investigated) formed a hemithioacetal at C-2 even though only 1 has a measurable rate of reduction by the same thiol. The remarkable rate enhancement provided by an oxa functionality suggests that reduction occurs by direct attack of thiolate on the hydroxamic nitrogen of a resonance-stabilized ion pair.

  DOI：

  10.1021/jo00005a025

文献信息

• BICYCLIC HETEROCYCLIC DERIVATIVES AS BROMODOMAIN INHIBITORS
  申请人：ORION CORPORATION

  公开号：US20160368906A1

  公开（公告）日：2016-12-22

  The present disclosure provides bicyclic heterocyclic derivatives of formula (I), which may be therapeutically useful, more particularly as bromodomain inhibitors; (I), in which R 1 , R 2 , R 3 , R 4 , L 1 , L 2 , Cy 1 , Cy 2 , X, n, and dotted line have the same meaning given in the specification, and pharmaceutically acceptable salts or pharmaceutically acceptable stereoisomers thereof that are useful in the treatment and prevention of diseases or disorders, in particular their use in diseases or disorders associated as bromodomain inhibitors. The present disclosure also provides preparation of compounds and pharmaceutical formulations comprising at least one of bicyclic heterocyclic derivatives of formula (I), together with a pharmaceutically acceptable carrier, diluent, or excipient.

  本公开提供了公式（I）的双环杂环衍生物，可能在治疗上有用，更具体地作为溴结构域抑制剂；（I）中，R1、R2、R3、R4、L1、L2、Cy1、Cy2、X、n和虚线具有规范中给定的相同含义，以及其在治疗和预防疾病或疾病中有用，特别是在与溴结构域抑制剂相关的疾病或疾病中的使用。本公开还提供了制备化合物和包括至少一种公式（I）的双环杂环衍生物的药物配方，以及药学上可接受的载体、稀释剂或赋形剂。
• Gauss,W.; Heitzer,H., Justus Liebigs Annalen der Chemie, 1970, vol. 733, p. 59 - 69
  作者：Gauss,W.、Heitzer,H.

  DOI：——

  日期：——
• ATKINSON, JEFFREY;MORAND, PETER;ARNASON, JOHN T.;NIEMEYER, HERMANN M.;BRA+, J. ORG. CHEM., 56,(1991) N, C. 1788-1800
  作者：ATKINSON, JEFFREY、MORAND, PETER、ARNASON, JOHN T.、NIEMEYER, HERMANN M.、BRA+

  DOI：——

  日期：——
• Chaudhury, Journal of the Indian Chemical Society, 1958, vol. 35, p. 621,630
  作者：Chaudhury

  DOI：——

  日期：——
• METHODS OF DETECTION USING X-RAY FLUORESCENCE
  申请人：Icagen, Inc.

  公开号：EP3681504A1

  公开（公告）日：2020-07-22