(4bS,8R,13bR)-1-methoxy-7-methyl-6,7,8,12,13,13b-hexahydro-5H,11H-4,8-methanobenzofuro[3,2-e][1,4]thiazino[3,2-g]isoquinoline 10,10-dioxide 在
甲烷磺酸 作用下,
反应 0.33h,
以81%的产率得到(9R)-4-methoxy-10-methyl-15,15-dioxo-15lambda6-thia-10,18-diazapentacyclo[11.7.1.02,7.09,21.014,19]henicosa-1(20),2(7),3,5,13(21),14(19)-hexaen-3-ol