111-24-0
二溴戊烷
+
122443-78-1
rac-6-acetyl-3,4-dihydro-7-hydroxy-2H-1-benzopyran-2-carboxylic acid methyl ester
→
~83%
120268-18-0
methyl 6-acetyl-7-((5-bromopentyl)oxy)chroman-2-carboxylate