Palladium-Catalyzed Carbonylative [2 + 2] Cycloaddition for the Stereoselective Synthesis of Either cis- or trans-3-Alkenyl .beta.-Lactams
作者:Hideo Tanaka、A. K. M. Abdul Hai、Masahiro Sadakane、Hiroshi Okumoto、Sigeru Torii
DOI:10.1021/jo00090a023
日期:1994.6
A new potential alkenylketene equivalent, prepared without use of a carboxylic acid or an activated derivative, has been exploited. Palladium-catalyzed carbonylation of an allyl phosphate in the presence of an imine and a tertiary amine under CO pressure (30 kg cm(-2)) stereoselectively gave either a cis-or trans-3-alkenyl beta-lactam in high yield. The stereochemical outcome strongly depends on the nature of the imine employed. Imines conjugated with a carbonyl such as a ketone or an ester stereoselectively produce cis-beta-lactams at room temperature, whereas imines unconjugated with a carbonyl group exclusively afford trans-beta-lactams at 70 degrees C.
Addition of α-bromoesters to azetidine-2,3-diones promoted by zinc-trimethylchlorosilane: a general synthesis of 3-trimethyisilyloxyazetidin-2-ones and α-alkylidene β-lactams.
作者:Claudio Palorno、Jesus M. Aizpurua、M. Concepción López、Natalia Aurrekoetxea、Mikel Oiarbide
DOI:10.1016/s0040-4039(00)97082-5
日期:1990.1
A convenient procedure for the preparation of a-alkylidene α-lactams from monocyclic azetidine-2,3-diones by means of the Reformatsky reaction is described.