4-Carbamoylmethyl-2-(3,5-di-tert.-butyl-4-hydroxybenzylidene)-3,4-dihydro-3-oxo-2H-1,4-benzothiazine 、 ammonium chloride 、
溴乙酸乙酯 以
四氢呋喃 、 mineral oil 为溶剂,
以0.59 g (93.3%)的产率得到2-[5-tert.-Butyl-3-[1,1-dimethyl-2-(tetrahydropyran-2-yloxy)ethyl]-4-hydroxybenzylidene]-3,4-dihydro-4-ethoxycarbonylmethyl-3-oxo-2H-1,4-benzothiazine