发现苯并[ d ]异恶唑可作为新型亲核试剂与金酰胺进行金催化的[5 + 1]或[5 + 2]环加成反应。该反应提供了对多取代的2 H-苯并[ e ] [1,3]恶嗪或苯并[ f ] [1,4]氧杂ze子的简明和化学选择性的途径。另外,苯并[ d ]异恶唑也可以与衍生自炔丙基酯的金卡宾中间体反应,得到[5 +1]环化产物。
杂环合成中的氧杂蒽酮。一种合成 C-3 邻羟基芳基取代的 1,2-苯并异恶唑及其 N-氧化物、血管紧张素 (II) 拮抗剂杂合肽的潜在支架的有效途径
摘要:
Regioselective substitution of xanthone and its nucleophilic cleavage allow the synthesis of C-3 o-hydroxyaryl substituted 1,2-benzisoxazoles or their N-oxides by cyclodehydration or oxidative cyclization of their corresponding ketoxime precursors, respectively. Molecular modeling analysis and H-1 NMR spectra indicate an intramolecular H-bonding engaging phenol OH and the isoxazole ring N atom.
An improved synthesis of 1,2-benzisoxazoles: TBAF mediated 1,3-dipolar cycloaddition of nitrile oxides and benzyne
作者:Christian Spiteri、Pallavi Sharma、Fengzhi Zhang、Simon J. F. Macdonald、Steve Keeling、John E. Moses
DOI:10.1039/b922489k
日期:——
An efficient synthesis of a range of 1,2-benzisoxazoles using an improved1,3-dipolarcycloaddition of nitrileoxides and benzyne is described. Key to the procedure is the in situgeneration of the reactive nitrileoxide and benzyne reaction partners mediated by TBAF. Reactions are complete within 30 s, giving the target products in good to excellent yield.
An efficient entry to 1,2-benzisoxazoles via 1,3-dipolar cycloaddition of in situ generated nitrile oxides and benzyne
作者:Christian Spiteri、Christopher Mason、Fengzhi Zhang、Dougal J. Ritson、Pallavi Sharma、Steve Keeling、John E. Moses
DOI:10.1039/b927235f
日期:——
An efficient protocol for the synthesis of a range of 1,2-benzisoxazoles using an improved1,3-dipolarcycloaddition of nitrileoxides and benzyne is described. Key to the procedure is the in situgeneration of the reactive nitrileoxide and benzyne reactants simultaneously.
novel, efficient, and facile protocol has been developed for transforming 2-hydroxybenzonitriles and bromides into a range of 3-aryl or alkylsubstituted 1,2-benzisoxazoles in good to excellent yields mediated by PPh3. The electronic and steric effects of bromides on the reaction are discussed. This is the first example to construct a C–C bond and heterocycle in a Barbier–Grignard-type reaction featuring
A new protocol has been developed for the synthesis of benzo[d]isoxazole through a palladium-catalyzed C–H bond functionalization–[4 + 1] annulation pathway.
已经开发出了一种新的协议,通过钯催化的C-H键官能化-[4 + 1]环化途径合成苯并[d]异噁唑。
Rhodium(<scp>iii</scp>)-catalysed redox neutral alkylation of 3-arylbenzo[<i>d</i>]isoxazoles: easy access to substituted succinimides
作者:Xuelin Yue、Xiang Zhao、Junwei Huang、Yijie Gao、Yadong Feng、Xiuling Cui
DOI:10.1039/d3ob00851g
日期:——
A convenient method for the alkylation of 3-arylbenzo[d]isoxazoles with maleimides under redox-neutral conditions has been developed, giving a series of substituted succinimides in up to 99% yield. This transformation is highly selective to give succinimides, and Heck-type products are successfully avoided. This protocol features 100% atom-economy and broad substrate tolerance, and provides a novel
开发了一种在氧化还原中性条件下用马来酰亚胺对3-芳基苯并[ d ]异恶唑进行烷基化的简便方法,得到一系列取代的琥珀酰亚胺,产率高达 99%。这种转化对于得到琥珀酰亚胺具有高度选择性,并且成功地避免了 Heck 型产物。该方案具有100%原子经济性和广泛的底物耐受性,为合成多种琥珀酰亚胺提供了一种新策略,为蛋白质药物的琥珀酰化和药理学家发现一流药物提供了机会。