Chemoselective Deprotection of Allylic Amines Catalyzed by Grubbs’ Carbene
作者:Benito Alcaide、Pedro Almendros、José Alonso、Amparo Luna
DOI:10.1055/s-2004-831211
日期:——
A commercially available ruthenium complex (first generation Grubbs’ carbene) was used for the catalytic deprotection of allylic amines (secondary as well as tertiary), by using for the first time reagents different from palladium catalysts. Interestingly, the catalytic system directs the reaction toward the selective deprotection of allylamines in the presence of allylic ethers.
Asymmetric Synthesis of Unusual Fused Tricyclic β-Lactam Structures via Aza-Cycloadditions/Ring Closing Metathesis
作者:Benito Alcaide、Pedro Almendros、Jose M. Alonso、María C. Redondo
DOI:10.1021/jo026112l
日期:2003.2.1
one systems. The diolefinic cyclization precursors can be obtained from optically pure 4-oxoazetidine-2-carbaldehydes bearing an extra alkene tether at position 1 or 3 of the beta-lactam ring via [2 + 2] cycloaddition of imino 2-azetidinones, N-metalated azometine ylide [3 + 2] cycloaddition, and subsequent N-acylation of the pyrrolidinyl nitrogen atom, or through aza-Diels-Alder cycloaddition of