(1S)-(-)-莰烷酰氯 、
5,6-dihydroxy-7,7-dimethyl-2-phenyl-6,7-dihydro-3H,5H-benzo[7,8]chromeno[5,6-b][1,4]oxazine-3-one 在
吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 18.0h,
以22%的产率得到6-hydroxy-7,7-dimethyl-3-oxo-2-phenyl-6,7-dihydro-3H,5H-benzo[7,8]chromeno[5,6-b][1,4]oxazin-5-yl 4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate