PURPOSE: To provide the novel compd. which is useful as antibiotics and β- lactamase inhibitors.
CONSTITUTION: This compd. is expressed by formula I (R1 is H methyl, etc.; R2 is H, 1 to 6C alkyl, etc.; R3 is H, methoxymethyl, etc.; X is F, Cl, etc.; Y is COOH, SO2, etc.); for example, [5R-[5α,6α(R*)]]-3-[[(2,4-difluorophenyl) sulfonyl]methylene-6-[1-[[(1,1-dimethylentyl)dimethylsillyl]oxy]ethyl]-7-oxo-1- azabicyclo[3,2,0]hept-2-en-2-carboxylic acid. The compd. is obtd. by bringing the tetra substd. allyl azethidine compd. of formula II (Q is an elimination group) into reaction with a nonaqueous base [e.g.; lithium(trimethnylsillyl)amide] at -90 to 20°C in an anhydrous inert non-protonic solvent. The compd. of the formula II is obtd. by using the compd. of formula III (M is metal) as a starting material.
UIRIAMU BUI KARAN
GURETSUGU FUEIJIERUSON
Next Patent: 1-AZABICYCLO(3.2.0)HEPTO-2-ENE-2-CARBOXYLIC ACID COMPOUND