Simple .beta.-lactam compounds derived from 6-aminopenicillanic acid

: As part of a general program of structural modification in beta-lactam antibiotics, we have synthesized several simple penicillins from 6-aminopenicillanic acid where the C-3 carboxyl group has been replaced by a hydroxy or an acetoxy group and the C-6 side chain has been substituted by bromine or hydrogen. Some of the compounds exhibit mild activity against the Gram-positive strain Bacillus subtilis.