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A novel stereospecific synthesis of (+)-muscarine and (+)-epi-muscarine has been achieved by utilizing d-glucose as a chiral precursor. The key steps of the synthesis involved stereospecific cyclization of 3,5-di-O-sulfonyl-d-glucofuranose derivatives into the corresponding 2,5-anhydrides, and stereospecific hydrogenation of 2,5-anhydro-l-threo-hex-2-enose ethylene acetal derivatives, thus providing...
Treatment of 2,5:3,6-dianhydro-6-thio-4-O-trifluoromethanesulfonyl-l-talose ethylene acetal (5) with lithium benzoate in boiling DMF unexpectedly gave the 9-crown-3 ether derivatives 7 and 8 instead of the substitution product 6. The mechanism of the process presumably involved neighbouring group participation of the dioxolane acetal function. 1 H NMR and molecular mechanics calculations...
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