potassium thioacyanate 、
1,3,4-tri-O-acetyl-2-deoxy-6-O-tosyl-β-D-arabino-hexopyranose 以
N,N-二甲基甲酰胺 为溶剂,
反应 24.0h,
以45%的产率得到3a,4a-dihydroxy-2,2,4',4',6,6-hexamethyl-1,2,3,3a,4a,5,6,7-octahydro-4,8,10-trioxaspiro[cyclohepta[def]fluorene-9,1'-cyclohexan]-3a
1(10a),4a
1(7a)-diene-2',6'-dione