| abstract |
A B S T R A C T There is provided a new group of thiazolene azetidinones such as methyl 3-anilino-4-thia-2,6-diazabicyclo-[3,2,0]hept-2-ene-7-one-6-isopropenyl(and propenyl)acetate, methyl 3-methylamino-4-thia-2,6-diazabicyclo [3.2.0]hept-2-ene-7-one-6-isopropenyl(and propenyl)acetate and methyl 3-phenoxy-4-thia-2,6-diazabicyclo [3,2,0]hept-2-ene-7-one-6-isopropenyl-(and propenyl)acetate. These compounds are useful intermedi-ates in the preparation of known cephalosporins or penicillins. |