作者:G Galley、M Pätzel、P.G Jones
DOI:10.1016/0040-4020(94)01049-6
日期:1995.2
Chiral α,β-unsaturated γ-alkoxy- or γ-amino-ketones (enones) 1 react with diazo compounds in a stereoselective manner affording conjugated Δ2-pyrazolines 5 and 6. In all cases syn-selectivity for the cycloaddition was observed. The diastereomeric ratio is improved at lower temperatures, but no significant influence of high pressure is observed. Carrying out this reaction with (E) and (Z) derivatives
手性α,β不饱和γ -烷氧基或γ氨基酮(烯酮)1用在以立体选择性方式重氮化合物,得到偶联反应Δ 2 -pyrazolines 5和6。在所有情况下SYN -选择性环加成进行了观察。在较低的温度下,非对映异构体比例有所提高,但是没有观察到高压的显着影响。用相同的烯酮1的(E)和(Z)衍生物进行该反应,得到相同的产物。