Stereospecific Rhodium-Catalyzed Allylic Substitution with Alkenyl Cyanohydrin Pronucleophiles: Construction of Acyclic Quaternary Substituted α,β-Unsaturated Ketones
作者:Ben W. H. Turnbull、Samuel Oliver、P. Andrew Evans
DOI:10.1021/jacs.5b10270
日期:2015.12.16
toward the synthesis of acyclic quaternary-substituted α,β-unsaturated ketones and thereby provides a new cross-coupling strategy for target directed synthesis. A particularly attractive feature with this process is the ability to directly couple di-, tri- and tetrasubstituted alkenyl cyanohydrin pronucleophiles to prepare the corresponding α,β-unsaturated ketone derivatives in a highly selective manner
The direct and highly diastereoselective synthesis of 3,4-epoxy-2-piperidones. Application to the total synthesis and absolute configurational assignment of 3α,4α-epoxy-5β-pipermethystine
作者:Urbano Osorio-Nieto、Laura Y. Vázquez-Amaya、Herbert Höpfl、Leticia Quintero、Fernando Sartillo-Piscil
DOI:10.1039/c7ob02700a
日期:——
The substrate-controlled asymmetric total synthesis and absolute configurationalassignment of biologically active 3α,4α-epoxy-5β-pipermethystine, a minor component in the aerial parts of kava, has been achieved by featuring, as a key step, the environmentally friendly and direct synthesis of 2,3-epoxyamides from allyl amines. By using the chiron approach, first a carbohydrate-derived dehydropiperidine