(2R,3R,4S)-5-morpholino-1-p-toluenesulfonyloxy-2-hydroxy-O-3,4-isopropylidene-pentane 在
potassium carbonate 作用下,
以
甲醇 为溶剂,
反应 0.08h,
以81%的产率得到(3'aS,7'R,7'aR)-2',2'-dimethylspiro[1,4-oxazinan-4-ium-4,5'-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyridin-5-ium]-7'-ol;4-methylbenzenesulfonate