The use of BrCCl3-PPh3 in Appel type transformations to esters, O-acyloximes, amides, and acid anhydrides
作者:Mariam Al-Azani、Mazen al-Sulaibi、Nuha al Soom、Yosef Al Jasem、Bernhard Bugenhagen、Bassam Al Hindawi、Thies Thiemann
DOI:10.1016/j.crci.2016.04.004
日期:2016.8
Abstract Esters, acyloximes, amides and acid anhydrides have been prepared from the respective carboxylic acids, oximes, amines and alcohols by the use of the reagent combination BrCCl3-PPh3. The reactions obviate the handling acyl halides or more aggressive reagents PCl3, POCl3, or SOCl2. Furthermore, the environmentally hazardous CCl4 used in Appel-type reactions is replaced with BrCCl3, a reagent
Titanium superoxide – a stable recyclable heterogeneous catalyst for oxidative esterification of aldehydes with alkylarenes or alcohols using TBHP as an oxidant
作者:Soumen Dey、Sunita K. Gadakh、A. Sudalai
DOI:10.1039/c5ob01586c
日期:——
A single step catalytic approach for the synthesis of esters from aldehydes using a recyclable heterogeneous catalyst is described.
一种利用可回收的非均相催化剂从醛类合成酯的单步催化方法被描述。
Superacid BF<sub>3</sub>–H<sub>2</sub>O promoted benzylation of arenes with benzyl alcohols and acetates initiated by trace water
An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
一种高效的原位制备的超强酸BF3-H2O促进的芳烃苄基化反应,使用苄醇和醋酸酯制备各种二芳基烷烃。
NHCs-mediated benzoates formation directly from aromatic aldehydes and alkyl halides
作者:Yi Li、Wenting Du、Wei-Ping Deng
DOI:10.1016/j.tet.2012.02.079
日期:2012.5
A NHCs-mediated benzoates formation was developed by treatment of aromatic aldehydes with alkylhalides in the presence of oxygen. Corresponding benzoate derivatives were obtained in high yields up to 99%. The reaction mechanism was also discussed and a NHCs-mediated O-alkylation and subsequent oxidation process was proposed.
Convenient Synthesis of Benziodazolone: New Reagents for Direct Esterification of Alcohols and Amidation of Amines
作者:Michael T. Shea、Gregory T. Rohde、Yulia A. Vlasenko、Pavel S. Postnikov、Mekhman S. Yusubov、Viktor V. Zhdankin、Akio Saito、Akira Yoshimura
DOI:10.3390/molecules26237355
日期:——
Hypervalent iodine heterocycles represent one of the important classes of hypervalent iodine reagents with many applications in organic synthesis. This paper reports a simple and convenientsynthesis of benziodazolones by the reaction of readily available iodobenzamides with m-chloroperoxybenzoic acid in acetonitrile at room temperature. The structure of one of these new iodine heterocycles was confirmed
高价碘杂环代表了一类重要的高价碘试剂,在有机合成中有许多应用。本文通过容易获得的iodobenzamides与反应报告benziodazolones的简单且方便的合成米氯过氧苯甲酸在室温下,在乙腈中。这些新的碘杂环之一的结构通过 X 射线分析得到证实。与 PPh 3和吡啶结合,这些苯并咪唑酮可以顺利地与醇或胺反应,分别生成相应的 3-氯苯甲酸酯或酰胺。发现在该酯化反应中,新型苯并碘酮试剂比类似的苯并恶酮试剂反应更有效。