| abstract |
A method of producing 1,2,4-benzothiadiazine-1,1-dioxidencompound of formula (I), including reacting a 2-aminobenzenesulfonamidencompound with a 1,1-dialkoxyalkenencompound or with an orthoester compound, in the presencenof an acid, to obtain an iminoether compound, and thennsubjecting the iminoether compound to a ring closurenreaction, in the presence of a base:n n wherein, in formula (I), R 1 is an alkyl group, or annaryl group; R 2 is a substituent; n is 0 to 4; and R 3 is anhydrogen atom or a substituent. |