作者:Jean A. Palmes、Paulo H. S. Paioti、Leonardo Perez de Souza、Aaron Aponick
DOI:10.1002/chem.201301723
日期:2013.8.26
at 0 °C, these dehydrative cyclization reactions require only mild conditions to produce vinyl‐substituted spiroketals in high yields after brief reaction times with water as the only byproduct. Using this method, the stereochemical information embedded at the nucleophile is transmitted “down‐the‐chain” and efficiently sets the stereochemistry at both the anomeric carbon atom and the newly formed allylic
报道了一种由简单的酮基烯丙基二醇形成螺环酮的高产立体选择性方法。这些脱水环化反应通过在0°C下于THF中使用催化[PdCl 2(MeCN)2 ]进行,仅需温和的条件即可在短暂的水反应时间后,以高收率生产乙烯基取代的螺酮金属。使用这种方法,亲核试剂中嵌入的立体化学信息会“向下传递”,并有效地在异头碳原子和新形成的烯丙基立体中心设置立体化学。