Novel cyclodextrin-oligosiloxane copolymers for use as stationary phases to separate enantiomers in open tubular column supercritical fluid chromatography
作者:Guoliang Yi、Jerald S. Bradshaw、Bryant E. Rossiter、Shawn L. Reese、Patrik Petersson、Karin E. Markides、Milton L. Lee
DOI:10.1021/jo00061a035
日期:1993.4
Five novel beta- (or alpha-) cyclodextrin- hexasiloxane copolymers have been prepared by a seven- (or nine-) step process. A key step was the reaction of partially alkylated beta- (or alpha-) cyclodextrin (8, 9, or 10) with p,p'-methylenebis(benzenesulfonyl chloride) to form a bissulfonate ester on the smaller rim of cyclodextrin. These bissulfonates were reacted with sodium p-(allyloxy)phenoxide followed by alkylation to form the peralkylated bis(allyloxyphenyl) beta- (or alpha-) cyclodextrins 17-20. Beta-Cyclodextrin bissulfonate ester 11 was also reacted with sodium azide followed by methylation, reduction, and acylation to form permethylated N,N'-bis[(allyloxy)benzoyl]-6A,6C-diamino-6A,6C-dideoxy-beta-cyclodextrin (24). The bisalkenes were copolymerized with dodecamethylhexasiloxane by the hydrosilylation process to give the cyclodextrin-containing copolymers. The copolymeric phases provided excellent enantiomeric separation of a variety of chiral solutes in open tubular column supercritical fluid chromatography (SFC).