A wide variety of oxathioacetals 1 as well as dithioacetals 2 can be chemoselectively deprotected to the corresponding carbonyl compounds 3 in good yields by employing NaNO2-AcCl and H2O in CH2Cl2 at 0 °C to room temperature. Some of the major advantages of this procedure are: mild conditions, easy to handle, highly chemoselective and efficient, high yields and inexpensive reagents. In addition, no acetylation occurs at the hydroxyl group nor chlorination takes place at the double bond.
多种氧
噻唑醚 1 以及双
噻唑醚 2 可以在温和的条件下,通过在 0 °C 到室温的
CH2Cl2 中使用 NaNO2-AcCl 和
H2O,
化学选择性地去保护为相应的羰基化合物 3,产率良好。该程序的一些主要优点包括:条件温和、操作简便、高度
化学选择性和高效、产率高以及试剂廉价。此外,羟基不发生
醋酸化,双键也不发生
氯化。