Patent ID: 7151182

Claim:
The compound having the formula: wherein R 1 is hydrogen or alkyl; R 2 is hydrogen, alkyl, alkylcarbonyloxyalkyl, alkoxycarbonyl, alkylcarbonyl, mono- or dialkylaminoalkylcarbonyloxyalkyl; group is pyridin-2-yl; L is a chloro, bromo, iodo, tosyloxy or mesyloxy; R 4 and R 5 are independently selected from the group consisting of hydrogen, halogen, alkyl, alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, carboxy, alkyloxycarbonyl, cyano, trifluoromethyl, trifluoromethoxy, nitro, aminosulfonyl, alkylaminocarbonyloxyalkyl, and sulfo, R 4 and R 5 are in addition alkylcarbonyloxyalkyl or aminoalkylcarbonyloxyalkyl and R 6 is hydroxy, alkoxycarbonylalkylamino, alkoxycarbonylamino, amino, alkylamino, alkylcarbonyloxy, alkoxycarbonylalkylaminoalkylcarbonyloxy, alkoxycarbonylaminoalkylcarbonyloxy, alkylaminoalkylcarbonyloxy, aminoalkylcarbonyloxy, alkylcarbonylamino, alkylcarbonylalkylamino, acyloxy, acylamino, or acylalkylamino.