Solution-phase synthesis and evaluation of tetraproline chiral stationary phases
作者:Zhi Dai、Guozhong Ye、Charles U. Pittman、Tingyu Li
DOI:10.1002/chir.22001
日期:2012.4
solution‐phasesynthesis of multigram amounts of two 9‐fluorenylmethoxycarbonyl (Fmoc)‐protected tetraproline peptides. These tetraproline peptides were then attached to amino derivatized silica gel. The replacement of the Fmoc group with the trimethylacetyl group lead to two tetraprolinechiralstationaryphases (CSPs). A comparison of the chromatographic behavior of these two solution‐phase‐synthesized
Chiral β-amino alcohol-derived N -borane catalysts, namely noncyclic ( 2S )- and ( 2R )-2-amino-2-phenylethanol N -borane and their corresponding cyclic trimeric borazine derivatives, were synthesized and their catalytic activities in the asymmetric reduction of prochiral ketones were examined. Both the noncyclic and cyclic catalysts successfully catalyzed this reaction, giving the desired secondary