The catalytic application of p-toluenesulfonyl chloride for efficient acetylation of various types of alcohols and phenols with acetic anhydride in solvent-free conditions is reported. Also structurally diverse alcohols were formylated using formic acid based on the use of catalytic amount of p-toluenesulfonyl chloride under solvent-free condition. The reactions were carried out in short reaction time
Magnetic nanoparticle-supported DABCO tribromide: a versatile nanocatalyst for the synthesis of quinazolinones and benzimidazoles and protection/deprotection of hydroxyl groups
supported on magnetic Fe3O4 nanoparticles (MNPs-DABCO tribromide) as a novel heterogeneous tribromide type compound was found to be an efficient and reusable nanocatalyst for the one-pot synthesis of 2-arylquinazolin-4(3H)-ones and 2-aryl-1H-benzo[d]imidazoles through oxidative cyclization of aldehydes with 2-aminobenzamides and 1,2-phenylenediamine, respectively. Also, MNPs-DABCO tribromide catalyzed tr
发现一种新型的非均相三溴化物类型化合物,负载在磁性Fe 3 O 4纳米颗粒上的1,4-二氮杂双环[2.2.2]辛烷三溴化物(MNPs-DABCO三溴化物)是一种高效且可重复使用的纳米催化剂,可用于一锅法合成2通过分别用2-氨基苯甲酰胺和1,2-苯二胺对醛进行氧化环化反应,制得-芳基喹唑啉-4(3 H)-ones和2-芳基-1 H-苯并[ d ]咪唑。而且,MNPs-DABCO三溴化物通过在室温下改变溶剂介质,催化了多种醇和酚的三甲基甲硅烷基化/四氢吡喃基化和甲硅烷基化/脱吡喃基化。
<i>p</i>-Toluenesulfonyl Chloride (<i>p</i>-TsCl)-Catalyzed Trimethylsilylation of Hydroxyl Groups Using Hexamethyldisilazane and Their Regeneration Under Mild Conditions: The First Example for Catalytic Application of <i>p</i>-Toluenesulfonyl Chloride
The first catalytic application of p-toluenesulfonyl chloride (p-TsCl) for the efficient and selective trimethylsilylation of various types of hydroxylgroups with hexamethyldisilazane (HMDS) in dichloromethane and desilylation of these compounds in water is reported. The reactions were carried out at room temperature and were found to proceed in good to excellent yields.
Novel and Highly Effective Method for the Trimethylsilylation of Alcohols and Phenols with Hexamethyldisilazane (HMDS), Catalyzed by I<sub>2</sub>Generated<i>in situ</i>Using Fe(NO<sub>3</sub>)<sub>3</sub>⋅9 H<sub>2</sub>O/NaI under Heterogeneous and Neutral Conditions
作者:Ardeshir Khazaei、Sadegh Rahmati、Amin Rostami
DOI:10.1002/hlca.200900002
日期:2009.7
Structurally diverse alcohols and phenols were trimethylsilylated in a clean and efficient reaction with hexamethyldisilazane (HMDS) based on the use of I2 generated in situ from Fe(NO3)3⋅9H2O/NaI. The reaction occurs very rapid in good‐to‐high yield in CH2Cl2 at room temperature, and the use of toxic and corrosive molecular I2 is avoided.
结构不同的醇和酚是在用六甲基二硅烷(HMDS)清洁和有效的反应基于使用的我三甲基甲硅烷2产生原位选自Fe(NO 3)3 ⋅9ħ 2 O /碘化钠。在室温下,该反应在CH 2 Cl 2中以高至高收率非常迅速地发生,并且避免使用有毒和腐蚀性的分子I 2。
Practical enantioselective synthesis of lamivudine (3TC™) via a dynamic kinetic resolution
作者:Michael D. Goodyear、Malcolm L. Hill、Jono P. West、Andrew J. Whitehead
DOI:10.1016/j.tetlet.2005.10.002
日期:2005.12
A practical enantioselectivesynthesis of lamivudine 1 is described. A highly effective dynamickineticresolution of the 5-hydroxyoxathiolane, followed by chlorination and introduction of cytosine provides an efficient synthesis of lamivudine.