5-chloro-3-hydroxy-3-(2-phenylethynyl)-1H-indol-2-one 在
tert-butylammonium hexafluorophosphate(V) 、 calcium(II) trifluoromethanesulfonate 作用下,
以
neat (no solvent) 为溶剂,
反应 8.0h,
生成 (3R,4'S,7'R)-5-chloro-7'-phenyl-5'-(p-tolyl)-3a',4',7',7a'-tetrahydrospiro[indoline-3,9'-[4,7]ethanoisobenzofuran]-1',2,3'-trione