Butyric acid (2R,3S,4aR,6S,7R,8aS)-7-methoxy-2-(2-methoxycarbonyl-propyl)-6-methoxymethyl-4a-methyl-octahydro-pyrano[3,2-b]pyran-3-yl ester 在
劳森试剂 作用下,
生成
Thiobutyric acid O-[(2R,3S,4aR,6S,7R,8aS)-7-methoxy-6-methoxymethyl-2-(2-methoxythiocarbonyl-propyl)-4a-methyl-octahydro-pyrano[3,2-b]pyran-3-yl] ester