Synthesis of 3-(2H-Indazol-2-yl)-2H[1]-Benzopyran-2-Ones
摘要:
Hitherto unknown 3-(2H-Indazol-2-yl)-2H[l]benzopyran-2-ones (4a-f) have been synthesized under the triethyl phosphite (TEP) mediated reaction conditions of 3-[[(2-nitrophenyl)-methylene] amino]-2H-1-benzopyran-2-ones (3a-f), obtained by the condensation of 3-amino coumarins (la-f) with 2-nitrobenzaldehyde (2).
A procedure has been developed for synthesis of 2-alkenyl-2H-indazoles starting from 2-(2-carbonylmethyl)-2H-indazoles, which are prepared by gallium/aluminium- and aluminium-mediated, direct, regioselective alkylation of indazoles with α-bromocarbonyl compounds. The structure of 3-(2H-indazol-2-yl)-2H-chromen-2-one was proven by X-ray crystallography. The styrene- and coumarin-2H-indazoles produced
已经开发了一种以 2-(2-羰基甲基)-2H-吲唑为原料合成 2-烯基-2H-吲唑的方法,该方法是通过镓/铝和铝介导的吲唑与 α 的直接区域选择性烷基化反应制备的。 -溴羰基化合物。3-(2H-indazol-2-yl)-2H-chromen-2-one 的结构已通过 X 射线晶体学证明。发现使用新方法生产的苯乙烯-和香豆素-2H-吲唑具有有趣的荧光特性。