transformation of a wide variety of alcohols or carboxylic acids into the corresponding halides. Yields are high and conditions are very mild thus allowing for the presence of sensitive functional groups. The reagents can be easily tuned allowing therefore the selective monohalogenation of polyhydroxylated molecules. The scope and chemoselectivity of the reactions have been studied and reaction mechanisms
A simple and convenient synthesis of β-haloketones
作者:John N. Marx
DOI:10.1016/s0040-4020(01)88558-6
日期:1983.1
quantitative method to synthesize β-halo-ketones is described (eqn 2) which utilizes the reaction of an enone with a tetraalkyl ammonium halide in anhydrous trifluoro acetic acid. The method is especially convenient for the preparation of β-iodoketones.
Synthesis of Pyranocyclopentaindolines Representing the Western Sections of Janthitrem B, JBIR‐137, and Shearinine G
作者:Marvin Fresia、Thomas Lindel
DOI:10.1002/ejoc.202101454
日期:2022.5.6
A set of pyranocyclopentaindolines: Tetracycles representing the ABCD partial structures of the fungal indole diterpenes janthitrem B, JBIR-137, and shearinine G were synthesized starting from indoline. The hydroxylated western section of janthitrem B was obtained in eight steps and 10 % overall yield.
一组吡喃环戊二烯:代表真菌吲哚二萜类 janthitrem B、JBIR-137 和舍利宁 G 的 ABCD 部分结构的四环化合物是从二氢吲哚开始合成的。janthitrem B 的羟基化西部切片分 8 步获得,总产率为 10%。
Thiocyanates in heterocyclic synthesis through nitrilium salts
In connexcion with a new synthetic approach to heterocyclic systems via nitriliumsalts, the reaction of organic thiocyanates, in place of the nitriles (with the exception of benzyl and p-nitrophenyl thiocyanates) yields heterocyclic compounds carrying a thioalkoxy group in the position next to the nitrogen atom in the ring.
A process for producing L-ascorbic acid, which comprises reacting 2-keto-L-gulonic acid with an acid in an ether or an inert organic solvent containing an ether in the presence of water and a surfactant.