Azetidinone derivatives and processes for production thereof
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04845210A1
公开(公告)日:1989-07-04
The invention relates to a method of producing an azetidinone derivative of the formula: ##STR1## which comprises reacting a compound of the formula ##STR2## with a compound of the formula ##STR3## and then subjecting the resulting compound to hydrolysis, the substituents above being as defined in the specification.
4-acyloxy-azetidinones in the presence of Lewis acids can be used to alkylate nucleophilic arenes in both the inter- and intramolecular processes. The former reactions were successfully carried out with p-dimethoxy-benzene in moderate yield, whereas the latter reactions can be done with a variety of nucleophilic arenes in a good yield.
Trimethylsilyl triflate promotes Ferrier−Petasis rearrangement of 4-(vinyloxy)-, 4-(propenyloxy)-, and 4-(isopropenyloxy)azetidin-2-ones to corresponding 4-(carbonylmethyl)azetidin-2-ones. The latter compounds may serve as attractive intermediates in the synthesis of carbapenem antibiotics. To illustrate the potential of this reaction, selected rearrangement products have been transformed into carbapenams