Reactions on a Solid Surface. A Simple, Economical, and Efficient Acylation of Alcohols and Amines over Al<sub>2</sub>O<sub>3</sub>
作者:Veejendra K. Yadav、K. Ganesh Babu
DOI:10.1021/jo035412f
日期:2004.1.1
Al2O3 brings about a rapid acylation of a range of alcohols and amines with acid chlorides and acid anhydrides, respectively. Amines are easily Boc- and Cbz-protected on reaction with Boc-anhydride and Cbz-Cl, respectively. The acylation of phenols is slow enough to allow chemoselective acylation of alcohols and amines in the presence of phenols.
Al 2 O 3分别使多种醇和胺分别与酰氯和酸酐快速酰化。分别与Boc酸酐和Cbz-Cl反应时,胺很容易受到Boc和Cbz保护。酚的酰化足够慢,以允许在酚存在下醇和胺的化学选择性酰化。
A USEFUL METHOD FOR SELECTIVE ACYLATION OF ALCOHOLS USING 2,2′-BIPYRIDYL-6-YL CARBOXYLATE AND CESIUM FLUORIDE
Primary and secondaryalcohols are acylated under mild conditions by the use of 2,2′-bipyridyl-6-yl carboxylates and cesium fluoride. Furthermore, the reaction is successfully applied to selectiveacylation of a primary carbinol group of diols containing primary and secondary carbinol groups or exclusive O-acylation of aromatic amino alcohols.
Me<sub>2</sub>S-induced Highly Selective Reduction of Aldehydes in the Presence of Ketones Involving Aldehyde-selective Rate Enhancement: A Triruthenium Cluster-catalyzed Hydrosilylation
Addition of appropriate amounts of Me2S unusually accelerated the hydrosilylation of aldehydes catalyzed by [Ru3(CO)7(Acy)] (1, Acy: µ3-η2,η3,η5-acenaphthylene). The reduction of ketones was comple...
Reactions of alkanes with different halogenating systems are compared in order to explore the reactivity of phthalimido-N-oxyl radical in hydrogen abstraction; the importance of polar effects is emphasised.
Highly efficient and versatile acetylation of alcohols catalyzed by cerium(III) triflate
作者:Renato Dalpozzo、Antonio De Nino、Loredana Maiuolo、Antonio Procopio、Monica Nardi、Giuseppe Bartoli、Roberto Romeo
DOI:10.1016/s0040-4039(03)01358-3
日期:2003.7
Cerium(III) triflate is a powerful catalyst for the acetylation of alcohols. The reaction works well for a large variety of simple and functionalized alcohols, without isomerisation of chiral centres. Changes of hydroxyl protective groups are possible in a one-pot procedure. The catalyst can be easily recycled. (C) 2003 Elsevier Ltd. All rights reserved.