From Penicillin to Penem and Carbapenem. VIII. Introduction of an Allyl Group at the C-4 Position of the Azetidinone Molecule, and the Synthesis of Dethiathienamycin
作者:Katsumi Fujimoto、Yuji Iwano、Koichi Hirai
DOI:10.1246/bcsj.59.1363
日期:1986.5
A new C3-unit introduction reaction at the C-4 position of 4-acetoxy-2-azetidinone derivatives using tetraallyltin in the presence of 1/10 equiv of boron trifluoride etherate in dichloromethane is described. Dethiathienamycin was synthesized from (3S,4R)-4-allyl-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-2-azetidinone via the ylide intermediate.
Indium-mediated Substitution of 4-Acetoxy-2-azetidinones: Synthesis of 4-Allyl-2-azetidinones
作者:Suk-Ku Kang、Tae-Gon Baik、Xiang-Hua Jiao、Kyong-Ju Lee、Cheol Hae Lee
DOI:10.1055/s-1999-2652
日期:1999.4
Indium-mediated allylation of 4-acetoxy-2-azetidinones with indium and allylic bromides in the presence of potassium iodide in DMF at room temperature afforded 4-allyl-substituted azetidinones under mild conditions in good yields.
A novel process for carbon-carbon bond formation at the C-4 position of 3-acylaminoazetidinones
申请人:ELI LILLY AND COMPANY
公开号:EP0163452A1
公开(公告)日:1985-12-04
The invention emcompasses a process for stereoselective carbon-carbon bond formation at the C-4 position of a 3 -(acylamino) azetidinone. The process is carried out under free radical conditions using a (2-substituted or unsubstituted allyl) tin reagent.