N-Ethylaniline → HCID 20081641, Verbindung

A 0.8 g quantity of 3-chloro-4-ethyl-1,2,4-benzothiadiazine-1,1-dioxide in the form of white crystals prepared in the same manner as in Reference Example 4 with the exception of using N-ethylaniline in place of N-methylaniline was added to a solution of 1.2 g of the N-[3-[3-(piperidinomethyl)phenoxy]propyl]-4'-methoxybenzylamine obtained in Example 1, (iii) in 12 ml of chloroform, and the mixture was stirred at room temperature for 8 hours. The reaction mixture was purified in the same manner as in Example 1, giving 1.67 g of 3-[N-[3-[3-(piperidinomethyl)phenoxy]-propyl]-4'-methoxybenzylamino]-4-ethyl-1,2,4-benzothiadiazine-1,1-dioxide (yield 88% ). This compound was converted to an oxalic acid salt in the same manner as in Example 1 to obtain 1.81 g of a compound 15 in the form of white crystals as listed in Table 1 (yield 92% ). M.p.: 85°~90° C.