| abstract |
The present invention converts a compound of formula (2) to a salt of formula (3), reacts a salt of formula (3) with a compound of formula (4) to obtain a compound of formula (5), and then reacts the compound of formula (5) in the presence of a base in a catalytic amount of cyanide By treating with ions, the present invention relates to a method for preparing the compound of formula (1).n n n Formula 1n n n n n n n n Formula 2n n n n n n n n Formula 3n n n n n n n n Formula 4n n n n n n n n Formula 5n n n n n n n n In the above formula 1 to 5,n n n Q, D, E, A, R 1 , R 2 , M + and X are as defined in the specification. |