Enantioselective Palladium(II)-Catalyzed Formal [3,3]-Sigmatropic Rearrangement of 2-Allyloxypyridines and Related Heterocycles
作者:Alessandro Rodrigues、Ernest E. Lee、Robert A. Batey
DOI:10.1021/ol9025759
日期:2010.1.15
Enantioselective palladium(II)-catalyzed formal [3,3]-sigmatropic rearrangement of (E)- and (Z)-allyloxy substituted N-heterocycles generates N-allyl N-heterocyclic amides in good yields and high enantioselectivities (up to 96% ee). The chiral palladacycle COP-Cl (5 mol %) is used as a catalyst with silver(I) trifluoroacetate (10 mol %) at 35−45 °C. Examples of heterocycles synthesized include 2-pyridones
对映选择性钯(II)催化的(E)和(Z)-烯丙氧基取代的N-杂环的正式[3,3]-σ重排生成N-烯丙基N-杂环酰胺,收率高,对映选择性高(高达96% ee)。在35-45°C下,手性palladacycle COP-Cl(5 mol%)与三氟乙酸银(I)(10 mol%)一起用作催化剂。合成的杂环的实例包括2-吡啶酮,喹啉-2(1 H)-和异喹啉-1(2 H)-。