Benzyl and allyl ethers have been cleaved readily on treatment with AlCl3 and N,N-dimethylaniline to give parent alcohols in high yields. Comparisons of N,N-dimethylaniline and anisole are also described.
A combination system of AlCl3–N,N-dimethylaniline was found to cleave benzylethers readily to give parent alcohols in excellent yields. The system also cleaved allyl as well as methyl ethers. Numerous functional groups such as benzoyloxy, phenylthio, and olefinic double bond were not affected. Comparisons of AlCl3–N,N-dimethylaniline and AlCl3–anisole were described.
A novel method for the conversion of ethers to esters by photo-oxidation using benzil and molecular oxygen, and its plausible reaction mechanism participated by benzoylperoxy radical are described.
A new O-benzylation reagent, benzyl N-phenyl-2,2,2-trifluoroacetimidate, has been developed. It even reacts with sterically hindered alcohols and base-sensitive hydroxy esters to afford the corresponding benzyl ethers catalyzed by TMSOTf in 1,4-dioxane. This reagent was more stable than benzyl 2,2,2-trichloroacetimidate, a known benzylation reagent.
一种新的 O 型苄基化试剂--N-苯基-2,2,2-三氟乙酰亚氨酸苄酯已经研制成功。在 1,4- 二氧六环中的 TMSOTf 催化下,它甚至能与立体受阻的醇和碱敏感的羟基酯发生反应,生成相应的苄基醚。这种试剂比已知的苄化试剂 2,2,2-三氯乙酰亚氨酸苄酯更加稳定。