A Catalytic Deprotection ofS,S-,S,O- andO,O-Acetals Using Bi(NO3)3⋅5 H2O under Air
作者:Naoki Komatsu、Azusa Taniguchi、Shinobu Wada、Hitomi Suzuki
DOI:10.1002/1615-4169(200107)343:5<473::aid-adsc473>3.0.co;2-o
日期:2001.7
(1–50 mol %) under ambient conditions to regenerate the original carbonyl compounds in good to excellent yield. This mild, simple, and environmentally benign system is successfully applied to the deprotection of S,O- and O,O-acetals and is compatible with various functional groups. From the mechanistic study of the reaction, the catalytic cycle is considered to be composed of the following four steps: (1) the
S,S -Acetals平滑地与空气脱保护的Bi(NO的催化量存在3)3 ⋅5ħ 2 O(1-50摩尔%)在环境条件下的良好的原始羰基化合物到再生高收率。这种温和,简单且对环境有益的系统已成功应用于S,O-和O,O-乙缩醛的脱保护,并与各种官能团兼容。从反应的机理研究来看,催化循环被认为由以下四个步骤组成:(1)S,S-乙缩醛的亚硝基attack离子是由Bi()生成的亚硝基离子(NO +)的侵蚀而形成的。NO 3)3 ⋅5ħ 2 ö通过与NO的平衡2,(2)离子nitrososulfonium被水解,得到硫代半缩醛和thionitrite,(3)硫代半缩醛折叠到原始的羰基化合物和硫醇,其通过氧化NO +,得到二氧化硫和一氧化二氮通过亚硝酸盐,并且(4)NO捕获空气中的分子氧以再生NO 2。