2-(1-carbamoyl-1-methylethyl)-5,7-dimethoxy-4-chromanone 、
溴化氢 在
5,5-Dimethyl-8-hydroxy-6-oxatetracycline 、 5,5-dimethyl-8-benzyloxy-10-0-benzyl-6-oxatetracycline 作用下,
以to give 2-(1-carbamoyl-1-methylethyl)-5,7-dihydroxy-4-chromanone, benzylation, conversion的产率得到2-(1-Carbamoyl-1-methylethyl)-5,7-dihydroxy-4-chromanone