从酮类到对映体富集的芳基烷基胺的温和有效途径已得到开发。首次成功地从肟中合成烯和三氟酰胺并进行不对称加氢,得到了高度对映体富集的三氟乙酰胺(94-98%ee)。在温和的条件下(K 2 CO 3,MeOH / H 2 O)释放出相应的苯乙基酰胺。另外,发现了Josiphos配体在烯乙酰胺和烯三氟乙酰胺的不对称氢化中的新应用。
从酮类到对映体富集的芳基烷基胺的温和有效途径已得到开发。首次成功地从肟中合成烯和三氟酰胺并进行不对称加氢,得到了高度对映体富集的三氟乙酰胺(94-98%ee)。在温和的条件下(K 2 CO 3,MeOH / H 2 O)释放出相应的苯乙基酰胺。另外,发现了Josiphos配体在烯乙酰胺和烯三氟乙酰胺的不对称氢化中的新应用。
Novel, Tunable, and Efficient Chiral Bisdihydrobenzooxaphosphole Ligands for Asymmetric Hydrogenation
作者:Wenjun Tang、Bo Qu、Andrew G. Capacci、Sonia Rodriguez、Xudong Wei、Nizar Haddad、Bikashandarkoil Narayanan、Shengli Ma、Nelu Grinberg、Nathan K. Yee、Dhileep Krishnamurthy、Chris H. Senanayake
DOI:10.1021/ol9025815
日期:2010.1.1
A series of novel, efficient, air-stable, and tunable chiral bisdihydrobenzooxaphosphole ligands (BIBOPs) were developed for rhodium-catalyzed hydrogenations of various functionalized olefins such as alpha-arylenamides, alpha-(acylamino)acrylic acid derivatives, beta-(acylamino)acrylates, and dimethyl itaconate with excellent enantioselectivities (up to 99% ee) and reactivities (up to 2000 TON).
Efficient synthesis of chiral phenethylamines: preparation, asymmetric hydrogenation, and mild deprotection of ene-trifluoroacetamides
作者:Shawn P. Allwein、J. Christopher McWilliams、Elizabeth A. Secord、Dale R. Mowrey、Todd D. Nelson、Michael H. Kress
DOI:10.1016/j.tetlet.2006.06.135
日期:2006.9
efficient route to enantioenriched aryl alkyl amines from ketones has been developed. The first successful synthesis and asymmetric hydrogenation of ene-trifluoroamides from oximes gave highly enantioenriched trifluoroacetamides (94–98% ee). The corresponding phenethyl amides are liberated under mild conditions (K2CO3, MeOH/H2O). In addition, a new application of Josiphos ligands toward the asymmetric hydrogenation
从酮类到对映体富集的芳基烷基胺的温和有效途径已得到开发。首次成功地从肟中合成烯和三氟酰胺并进行不对称加氢,得到了高度对映体富集的三氟乙酰胺(94-98%ee)。在温和的条件下(K 2 CO 3,MeOH / H 2 O)释放出相应的苯乙基酰胺。另外,发现了Josiphos配体在烯乙酰胺和烯三氟乙酰胺的不对称氢化中的新应用。