o-Directed Lithiation of Acylated Hydroxythiophenes
摘要:
O-Carbamates derived from 2-hydroxy- and 3-hydroxy-thiophenes generated o-directed carbanions, which were transformed to the corresponding methyl sulfides and methyl and trimethylsilyl substituted thiophenes.Dedicated to Professor Viktoras Snieckus, an eminent organic chemist and initiator of Balticum Organicum Syntheticum (BOS), in occasion of his 77th birthday
The present invention relates to certain penem derivatives of the general formula I ##STR1## in which R represents a hydrogen atom or a carboxyl esterifying group, R.sup.1 represents certain unsubstituted and substituted aromatic and heterocyclic groups, and R.sup.2 represents a hydrogen atom, an unsubstituted or substituted alkyl or aryl group. The compound of formula I and salts thereof may be used in the treatment of bacterial infections in man and other animals.
O-Carbamates derived from 2-hydroxy- and 3-hydroxy-thiophenes generated o-directed carbanions, which were transformed to the corresponding methyl sulfides and methyl and trimethylsilyl substituted thiophenes.Dedicated to Professor Viktoras Snieckus, an eminent organic chemist and initiator of Balticum Organicum Syntheticum (BOS), in occasion of his 77th birthday