The Iridium‐catalyzedasymmetrichydrogenation of cyclic sulfamidate imines was successfully developed with N‐methylated ZhaoPhos L2 as the ligand. A variety of chiral cyclic sulfamidates were obtained with excellent results (up to 99% yield, 99% ee). Furthermore, this asymmetrichydrogenation can be employed as the key reaction step to prepare the important intermediates in organic synthesis.
Enantioselective Synthesis of Cyclic Sulfamidates by Using Chiral Rhodium-Catalyzed Asymmetric Transfer Hydrogenation
作者:Soyeong Kang、Juae Han、Eun Sil Lee、Eun Bok Choi、Hyeon-Kyu Lee
DOI:10.1021/ol1017905
日期:2010.9.17
Asymmetric transfer hydrogenation (ATH) of cyclic sulfamidate imines 4 and 9, using a HCO2H/Et3N mixture as the hydrogen source and well-defined chiral Rh catalysts (S,S)- or (R,R)-2, Cp*RhCl(TsDPEN), effectively produces the corresponding cyclic sulfamidates with excellent yields and enantioselectivities at room temperature within 0.5 h. ATH of 4,5-disubstituted imines 9, having preexisting stereogenic
使用HCO 2 H / Et 3 N混合物作为氢源和定义明确的手性Rh催化剂(S,S)-或(R,R)-2,对环状氨基磺酸亚胺4和9进行不对称转移氢化(ATH), Cp * RhCl(TsDPEN)可在室温下0.5h内以优异的收率和对映选择性有效生产相应的环状氨基磺酸酯。具有预先存在的立体生成中心的4,5-二取代的亚胺9的ATH显示以动态动力学拆分发生。
Enantioselective intramolecular amidation of sulfamate esters catalyzed by chiral manganese(III) Schiff-base complexes
作者:Ji Zhang、Philip Wai Hong Chan、Chi-Ming Che
DOI:10.1016/j.tetlet.2005.05.146
日期:2005.8
Enantioselective intramolecularamidation of sulfamate esters catalyzed by chiral manganese(III) Schiff-base complexes under mild conditions (PhI(OAc)2, Al2O3, C6H6, 5 °C) was achieved in moderate to good yields (up to 92%), substrate conversions (up to 99%), with virtually complete cis-selectivity and with ee values up to 79% ee.
通过温和的条件下的手性锰(III)的席夫碱配合物催化的氨基磺酸酯的对映选择性的分子内酰胺化(PHI(OAC)2,AL 2 ö 3,C 6 H ^ 6,5℃)在中度至良好的产率达到(最多至92%),底物转化率(高达99%),几乎完全的顺式选择性和ee值高达ee的79%。