N-苯基双(三氟甲烷磺酰)亚胺 、
5-hydroxy-7-isopropyl-4-oxo-3,4-dihydrospiro[chromen-2,1'-cyclobutane]-6-carbaldehyde 在
potassium carbonate 作用下,
以
DMF (N,N-dimethylformamide) 为溶剂,
以65%的产率得到6-formyl-7-isopropyl-4-oxo-3,4-dihydrospiro[chromen-2,1'-cyclobutan]-5-yl trifluoromethanesulfonate