Abstract
It was anticipated that stannylation of carbohydrates could be achieved using tin on a polymer-support. Such immobilization simplifies the purification of the carbohydrate because the toxic tin reagent can be removed by filtration. In this case an alkene linker (3-buten-1-ol) was added to chloromethylated 2% cross-linked polystyrene by etherification. Photochemical hydrostannylation with dibutyltinchlorohydride gave a polymer bound trialkyl tin chloride. The Sn-Cl could be hydrolysed with NaOH to yield a resin with terminal Sn-O bonds. Highly regioselective acylation of methyl α-D-mannopyranoside (αMeMan) to its 3-O-benzoyl derivative was achieved. Traces of the mono 6-O-benzoate and the 3,6-di-O-benzoate were also obtained. Methyl α-D-glucopyranoside was also selectively acylated to its 2-O-benzoate but this reaction gave a more complex mixture. The isolated yields (10–30% based on sugar) were disappointingly low. The yields were improved to about 60% with 5% cross-linked resin.
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Whitfield, D., Ogawa, T. Polymer-supported tin carbohydrate chemistry. Glycoconj J 15, 75–78 (1998). https://doi.org/10.1023/A:1006995617644
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DOI: https://doi.org/10.1023/A:1006995617644