Allylation of Aldehyde and Imine Substrates with In Situ Generated Allylboronates - A Simple Route to Enatioenriched Homoallyl Alcohols
作者:Sara Sebelius、Kálmán J. Szabó
DOI:10.1002/ejoc.200500069
日期:2005.6
Allylation of aldehyde and imine substrates was achieved using easily available allylacetates and diboronate reagents in the presence of catalytic amounts of palladium. This operationally simple one-pot reaction has a broad synthetic scope, as many functionalities including, acetate, carbethoxy, amido and nitro groups are tolerated. The allylation reactions proceed with excellent regio- and stereoselectivity
在催化量的钯存在下,使用容易获得的乙酸烯丙酯和二硼酸酯试剂实现醛和亚胺底物的烯丙基化。这种操作简单的一锅反应具有广泛的合成范围,因为可以耐受许多官能团,包括乙酸酯、羧基乙氧基、酰胺基和硝基。烯丙基化反应以优异的区域和立体选择性进行,得到支化的烯丙基异构体。通过使用市售的手性二硼酸酯,可以获得对映体富集的高烯丙醇(高达 53% ee)。机理研究表明,原位生成的烯丙基硼酸酯直接与醛底物反应,但是磺酰亚胺底物的烯丙基化需要钯催化。