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
描述了高度区域和立体定向铑催化的叔烯丙基碳酸酯与烯基氰醇原亲核试剂的烯丙基烷基化。该协议为合成无环四元取代的α,β-不饱和酮提供了一种全新的方法,从而为目标定向合成提供了一种新的交叉偶联策略。该方法的一个特别吸引人的特点是能够直接偶联二、三和四取代的烯基氰醇原亲核试剂,以高度选择性的方式制备相应的 α,β-不饱和酮衍生物。此外,烯酮产物的化学选择性 1,4-还原提供了快速获取无环对映体富集的 α,α'-二烷基取代酮的途径,