tert-butyl 2-oxo-3-(2-oxo-2-propan-2-yloxyethylidene)indole-1-carboxylate 、
C-4-fluorophenyl-N-phenyl nitrone 在
1,1'-((1R,2R)-cyclohexane-1,2-diyl)bis(3-(3,5-bis(trifluoromethyl)phenyl)thiourea) 作用下,
以
正己烷 为溶剂,
反应 48.0h,
以69%的产率得到1-tert-butyl (3R,3'R,5'R)-5'-isopropyl 3'-(4-fluorophenyl)-2-oxo-2'-phenylspiro[indoline-3,4'-isoxazolidine]-1,5'-dicarboxylate