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.
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.
Xanthones in Heterocyclic Synthesis. An Efficient and General Route for the Synthesis of Regioselectively Substituted Phthalazines
作者:Petros G. Tsoungas、Paul Cordopatis、Yiannis Gardikis、Constantinos Potamitis、Maria Zervou、George Pairas
DOI:10.3987/com-11-12168
日期:——
Xanthone undergoes regioselective substitution and nucleophically triggered ring opening to the corresponding ketone. Hydrazone of the latter oxidatively rearranges to ortho-diacylarenes, which, then, with hydrazine gives regioselectively substituted phthalazines. Molecular modeling analysis and H-1 NMR spectra indicate an intramolecular H-bonding engaging phenol OH and phthalazine N-3 atom.