tert-butyl [1-(5-methylisothiazol-3-yl)ethyl]carbamate 、 4-chloro-N-[1-(5-methylisothiazol-3-yl)ethyl]benzenesulfonamide 、 tert-butyl [1-(5-ethylisothiazol-3-yl)ethyl]carbamate 以to afford Intermediate 12e的产率得到4-chloro-N-[1-(5-ethylisothiazol-3-yl)ethyl]benzenesulfonamide