This paper presents the enantioseparation using glucose, cellobiose, lactose and raffinose as chiral selector bonded to silica gel via an arm in HPLC. Surprisingly, they also possess high enantioseparation selectivity...This paper presents the enantioseparation using glucose, cellobiose, lactose and raffinose as chiral selector bonded to silica gel via an arm in HPLC. Surprisingly, they also possess high enantioseparation selectivity, may be used in normal-phase and reversed- phase mode, and there is a big chiral discriminating complementary. This work indicates that oligosaccharides could soon become very attractive as a new class of chiral stationary phase for HPLC.展开更多
In this paper,brinzolamide(S)-isomer was synthesized from 3-(2-bromoacetyl)-5-chloro-2-thiophenesulfonamide over five-step reactions of reduction cyclization,N-alkylation,sulfamation,amino protecting and amination fir...In this paper,brinzolamide(S)-isomer was synthesized from 3-(2-bromoacetyl)-5-chloro-2-thiophenesulfonamide over five-step reactions of reduction cyclization,N-alkylation,sulfamation,amino protecting and amination firstly,in total yield of 23%.The structures were characterized by 1H NMR、MS.The mixture of brinzolamide and its(S)-isomer was analyzed by HPLC indicating the resolution factor was 3.022 between brinzolamide and its(S)-isomer through column selection and factor modulation.The e.e.value of synthesized brinzolamide(S)-isomer was 96.9%.展开更多
基金National Natural Science Foundation and Yunnan Province's Natural Science Foundation of China(No.20775066No.2005E0006Z).
文摘This paper presents the enantioseparation using glucose, cellobiose, lactose and raffinose as chiral selector bonded to silica gel via an arm in HPLC. Surprisingly, they also possess high enantioseparation selectivity, may be used in normal-phase and reversed- phase mode, and there is a big chiral discriminating complementary. This work indicates that oligosaccharides could soon become very attractive as a new class of chiral stationary phase for HPLC.
文摘In this paper,brinzolamide(S)-isomer was synthesized from 3-(2-bromoacetyl)-5-chloro-2-thiophenesulfonamide over five-step reactions of reduction cyclization,N-alkylation,sulfamation,amino protecting and amination firstly,in total yield of 23%.The structures were characterized by 1H NMR、MS.The mixture of brinzolamide and its(S)-isomer was analyzed by HPLC indicating the resolution factor was 3.022 between brinzolamide and its(S)-isomer through column selection and factor modulation.The e.e.value of synthesized brinzolamide(S)-isomer was 96.9%.