Abstract Addition reactions of acid chlorides with various 2-substituted 4, 5-dihydro-4, 4- dimethyl-5-(methylsulfanyl)-1, 3-thiazoles under basic conditions were studied. Two kinds of products were obtained from these additions, β-lactams and non-β-lactam adducts. When the reaction was carried out with 4, 5-dihydro-1, 3-thiazoles with a Ph substituent at C (2), the reaction proceeded via formal [2+ 2] cycloaddition and led to the correspoding β- ...
