(2012/09/10)
tert-butyl 4-phenylspiro[chromene-2,4'-piperidine]-1'-carboxylate
N-tert-butyloxycarbonylpiperidin-4-one
tert-butyl 4-(trifluoromethylsulfonyloxy)spiro[chromene-2,4'-piperidine]-1'-carboxylate
tert-butyl 4-oxo-3,4-dihydro-1'H-spiro[chromene-2,4'-piperidine]-1'-carboxylate
o-hydroxyacetophenone