Vinylogous nucleophilic catalysis. Tertiary amine promoted hydrolysis of 1-alkene-1-sulfonyl chlorides
作者:James Frederick King、John Henry Hillhouse、Stanisław Skonieczny
DOI:10.1139/v84-339
日期:1984.10.1
We present evidence that the reactions of ethenesulfonyl chloride (1) and trans-1-propene-1-sulfonyl chloride (3) with water in the presence of pyridine, trimethylamine, and a number of other tertiary amines proceed primarily by way of an initial vinylogous substitution reaction to form the cationic sulfene, , which subsequently reacts with water either by addition (and deprotonation) to form the betaine
The present invention is to provide a method of producing a carbonyl compound at a higher yield. The method of producing a carbonyl compound according to the present invention produces a carbonyl compound represented by general formula (I) by subjecting a compound represented by general formula (II) to dealkoxycarbonylation in the presence of a hydrogen halide salt of tertiary amine.
In the formula, R represents an alkyl group having from 1 to 4 carbons.
solvent, an array of xanthenes, thiazole, pyrazine, and pyridazine are compatible with this new arylation approach. The broad substrate scope, mild reaction conditions, and use of water as reaction solvent make this procedure a practical and environmentally friendly method for the synthesis of compounds containing aryl‐heteroaryl motifs.
已经开发出一种高效的可见光促进的N-杂芳烃与芳基重氮盐在水中的“自由基型”偶联。在室温下将反应继续进行的[Ru(联吡啶)3 ]氯2 ⋅ 6 H 2O作为光敏剂,商用灯泡作为光源。在这些反应条件下,吡啶和各种取代的吡啶是有效的底物,仅形成具有不同区域选择性的单取代产物。使用甲酸水溶液作为溶剂,一系列的黄嘌呤,噻唑,吡嗪和哒嗪与这种新的芳基化方法兼容。广泛的底物范围,温和的反应条件以及使用水作为反应溶剂,使得该程序成为合成具有芳基-杂芳基基序的化合物的实用且环境友好的方法。
METHOD FOR PREPARING 2,3-DICHLORO-5-TRIFLUOROMETHYLPYRIDINE WITH HIGH SELECTIVITY
The present invention discloses a method for preparing 2,3-dichloro-5-trifluoromethylpyridine, comprising at a temperature of 100˜150° C. and a pressure of 0.5˜5.0 MP, in presence of at least one catalyst selected from supported metal chloride, supported zeolite molecular sieve and supported heteropolyacid, 2-chloro-5-trifluoromethylpyridine reacts with chlorine gas to obtain 2,3-dichloro-5-trifluoromethylpyridine. The preparing method provided by the present invention has advantages such as high selectivity of desired product, high utilization rate of chlorine gas, moderate process condition, simple operation and less three wastes. The present invention also discloses a preparing method for preparing 2-chloro-5-trifluoromethylpyridine, which is capable of reducing unit consumption, reducing separation cost, and improving safety compared to the prior art.
[EN] NICOTINE DERIVATIVES AND METHODS OF USE<br/>[FR] DÉRIVÉS DE NICOTINE, ET PROCÉDÉS POUR LEUR UTILISATION
申请人:GOODMAN JORY F
公开号:WO2015183530A1
公开(公告)日:2015-12-03
This invention provides a compound selected from the group consisting of L- nicotine(X1)(X2) and D-nicotine(X1)(X2), or a pharmaceutically acceptable salt thereof, wherein (i) each of Χ1 and X2 is independently a pharmaceutically acceptable anion or a null set; and (ii) Χ1 and X2 cannot both be null sets. This invention also provides related compositions, as well as methods for treating a disorder reasonably believed to be ameliorated by the administration of nicotine.