Heteropoly Acid-catalyzed Direct Substitution of 2-Propynyl Alcohols with Sulfonamides
作者:J. S. Yadav、B. V. Subba Reddy、T. Srinivasa Rao、B. Bala. M. Krishna、G. G. K. S. Narayana Kumar
DOI:10.1246/cl.2007.1472
日期:2007.12.5
Directsubstitution of the hydroxygroup in 2-propynyl alcohols with sulfonamides has been achieved using 5 mol % of phosphomolybdic acid supported on silica gel (PMA/SiO2) under mild reaction cond...
Gold(I)-Catalyzed Highly Regio- and Stereoselective Decarboxylative Amination of Allylic <i>N</i>-Tosylcarbamates via Base-Induced Aza-Claisen Rearrangement in Water
作者:Dong Xing、Dan Yang
DOI:10.1021/ol100056f
日期:2010.3.5
A gold(I)-catalyzed decarboxylative amination of allylic N-tosylcarbamates via base-induced aza-Claisen rearrangement has been developed. A variety of substituted N-tosyl allylic amines were obtained in good yield, excellent regioselectivity, and high to excellent stereoselectivity. This transformation could be performed either in H2O or in one pot directly from allylic alcohols and therefore represents
An efficient FeCl3-catalyzed amidation reaction of secondary benzylic and allylic alcohols with carboxamides or p-toluenesulfonamide
作者:Umasish Jana、Sukhendu Maiti、Srijit Biswas
DOI:10.1016/j.tetlet.2007.11.176
日期:2008.1
A simple, inexpensive, environmentally friendly and high yielding amidationreaction of benzylic and allylic alcohols with primary amides using a catalytic amount of FeCl3 (5 mol %) is described. Direct substitution of various amides such as benzamide, sulfonamide, acetamide and acrylamide is reported, and this method also works on a large scale in high yield.
作者:Yulei Wang、Zhipeng Lin、João C. A. Oliveira、Lutz Ackermann
DOI:10.1021/acs.joc.1c00682
日期:2021.11.19
The oxidative intermolecular nitrogenation of C(sp3)–H bonds represents one of the most straightforward strategies to construct nitrogen-containing molecules. However, a sacrificial chemical oxidant is generally required. Herein, we describe electrochemical oxidative intermolecular allylic C(sp3)–Haminations in an undivided cell by electric current. The cross-dehydrogenative amination proceeded efficiently
C(sp 3 )-H 键的氧化分子间氮化代表了构建含氮分子的最直接的策略之一。然而,通常需要牺牲化学氧化剂。在此,我们通过电流描述了未分割电池中的电化学氧化分子间烯丙基 C(sp 3 )-H 胺化。在无金属和无化学氧化剂的反应条件下,交叉脱氢胺化反应在大范围内有效进行,得到分子 H 2作为唯一的副产物。
Preparation of Azetidines by 4-endo trig Cyclizations ofN-Cinnamyl Tosylamides
Formation of azetidines by electrophilic cyclizations have been reported, starting with homoallylic amines (4-exo mode cyclizations). We reported that the formation of these compounds can be carried out starting with allylic amines (4-endo mode cyclizations) using bis(collidine)bromonium(I) hexafluorophosphate as an electrophile. These cyclizations occur via a carbocation intermediate.