A wide variety of 1,3-oxathiolanes 1 can be chemoselectively deprotected to the corresponding carbonyl compounds 2 in good yields by employing V2O5–H2O2 catalyzed oxidation of ammonium bromide in a CH2Cl2–H2O mixture at 0–5 °C. Some of the major advantages of this procedure are its mild conditions, and that it is highly selective and efficient, high yielding, and cost-effective. Furthermore, no brominations occur at the double bond or allylic position or α to the keto position or aromatic ring.
多种1,3-氧
硫杂环烷1可以通过V2O5–
H2O2催化氧化
溴化铵在0–5°C的
CH2Cl2–
H2O混合物中选择性脱保护,高产率地转化为相应的羰基化合物2。该方法的主要优点包括条件温和、选择性高、效率高、产率高且成本效益好。此外,不会在双键或烯丙位、酮位α或芳环上发生
溴化。