6-ethylthiochroman-4-one 、 、
亚硝酸异戊酯 、
钾 、 6-ethyl-3-hydroxyimino-2,3-dihydro-4H-1-benzothiopyran-4-one 、
盐酸 、
3-amino-2-chloro-6-ethyl-4H-1-benzothiopyran-4-one 以After hydrogenation there is obtained 3-amino-6-ethyl-4H-1-benzothiopyran-4-one having a melting point of 106°-107°的产率得到3-amino-6-ethyl-4H-1-benzothiopyran-4-one