| 摘要 |
NEW MATERIAL:The 5-amino-1H-pyrazole compound of formula I (Ar is aryl or 5-6-membered heteroaromatic group; R1 is H, alkyl, aryl or 5-6-membered heteroaromatic group; X is H, halogen, cyano, alkoxycarbonyl, aryloxycarbonyl or carboxyl). EXAMPLE:3-Anilino-5-amino-4-methoxycarbonylpyrazole. USE:An intermediate for photographic coupler having substituted amino group at 6-site. PREPARATION:A compound of formula I wherein X is Y can be produced by reacting a compound of formula II (Y is cyano or alkoxycarbonyl) with CS2 in an alcohol in the presence of Na, alkylating the product, reacting the resultant compound of formula III (Alk is alkyl) with the compound of formula Ar-N(R1)H to obtain a compound of formula 3 and cyclizing the compound together with NH2-NH2. |
