作者:Prasad V. Chaturvedula、Stephen E. Mercer、Leatte Guernon、John E. Macor、Gene M. Dubowchik
DOI:10.1016/j.tetlet.2010.08.057
日期:2010.10
through a tandem palladium-mediated Heck reaction followed by a rhodium(II)-catalyzed asymmetric hydrogenation. Aryl bromides were found to be better substrates in providing products with higher purity and in good yield. The cesium carbonate-mediated cyclization proceeded smoothly in good yield and optical purity. Aryl iodides reacted selectively over bromides under Jeffery-type conditions (Pd(OAc)2, Bu4NCl
通过串联钯介导的Heck反应,然后由铑(II)催化的不对称氢化,合成了含有疏水基团和氢键受体和/或供体官能团的受约束的苯丙氨酸衍生物。在提供更高纯度和高收率的产品中,发现芳基溴化物是更好的底物。碳酸铯介导的环化以良好的收率和光学纯度顺利进行。芳基碘化物在Jeffery型条件下(Pd(OAc)2,Bu 4 NCl,Et 3 N)在溴化物上选择性反应,为进一步金属介导的官能化提供了机会。