Uno Hiroto, Fujimoto Daichi, Harada Kyosuke, Tanaka Chika, Shibata Norio
Department of Nanopharmaceutical Sciences, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
Department of Life Science and Applied Chemistry, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya, 466-8555, Japan.
ChemistryOpen. 2021 May;10(5):518-522. doi: 10.1002/open.202000360. Epub 2021 Feb 19.
Efficient synthesis of N,O-heterocyclic tetra-substituted trifluoromethyl-3,1-benzoxazines via a transition-metal-catalyzed decarboxylative intramolecular cyclization was achieved. The decarboxylation of N-benzoyl trifluoromethyl-benzoxazinones generated the amide oxygen nucleophile, allowing a selective internal C -attack on Pd- or Cu-coordinated zwitterions, affording medicinally attractive tetra-substituted vinyl- or ethynyl-trifluoromethyl-3,1-benzoxazines. This protocol can be applied to the synthesis of perfluoroalkyl- and non-fluorinated 3,1-benzoxazines.
通过过渡金属催化的脱羧分子内环化反应,实现了N,O-杂环四取代三氟甲基-3,1-苯并恶嗪的高效合成。N-苯甲酰基三氟甲基苯并恶嗪酮的脱羧反应生成了酰胺氧亲核试剂,使得其能够对钯或铜配位的两性离子进行选择性的分子内C-进攻,从而得到具有药用吸引力的四取代乙烯基或乙炔基三氟甲基-3,1-苯并恶嗪。该方法可应用于全氟烷基和非氟化3,1-苯并恶嗪的合成。