2-[(3-tert-butyl-7-methyl-3,4-dihydro-2H-benzo[1,4]oxazin-5-yl)-(2,3-dimethoxyphenyl)-methylsulfanyl]-succinic acid 在
对甲苯磺酸 作用下,
以
氯苯 、
甲苯 为溶剂,
以610 mg (46%)的产率得到[1-tert-butyl-7-(2,3-dimethoxyphenyl)-5-methyl-10-oxo-1,2,9,10-tetrahydro-7H-3-oxa-8-thia-10a-aza-cyclohepta[de]naphthalen-9-yl]-acetic acid