A simple, general synthesis of carbonimidic dichlorides
作者:Claire M. Gober、Hoang V. Le、Bruce Ganem
DOI:10.1016/j.tetlet.2012.06.046
日期:2012.8
The reaction of aliphatic and aromatic isonitriles with sulfuryl chloride provides an efficient, general route to the corresponding dichlorides without byproducts of free-radical substitution.
脂肪族和芳香族异腈与磺酰氯的反应为相应的二氯化物提供了一种有效的通用途径,没有自由基取代的副产物。
Kuehle,E. et al., Angewandte Chemie, 1969, vol. 81, p. 18 - 32
作者:Kuehle,E. et al.
DOI:——
日期:——
TANAKA S.; OKANO M.; TANIMOTO S., BULL. CHEM. SOC. JAP. <BCSJ-A8>, 1975, 48, NO 6, 1862-1864
作者:TANAKA S.、 OKANO M.、 TANIMOTO S.
DOI:——
日期:——
Electrochemical generation of alkyl and aryl isocyanides
作者:Antoio Guirado、Andrés Zapata、Jesús L. Gómez、Luis Trabalón、Jesús Gálvez
DOI:10.1016/s0040-4020(99)00509-8
日期:1999.7
An efficient and widely applicable reagent-free method for the synthesis of alkyl and arylisocyanides has been established. The electrochemical reduction of alkyl and aryl carbonimidoyl dichlorides under constant cathode potential leads to the corresponding isocyanides in almost quantitative yields. The availability of the starting materials, the mildness of the reaction conditions as well as the
Higher-Order Cyclopropenimine Superbases: Direct Neutral Brønsted Base Catalyzed Michael Reactions with α-Aryl Esters
作者:Eric D. Nacsa、Tristan H. Lambert
DOI:10.1021/jacs.5b05033
日期:2015.8.19
The synthesis and characterization of six new classes of higher-order superbases, including five that incorporate cyclopropenimine functionality, has been achieved. We propose a nomenclature that designates these as the CG(2), GC(2), PC3, PC1, C-3, and GP(2) classes of superbases. The pK(BH+) values were measured to be between 29.0 and 35.6 in acetonitrile. Linear correlations of ten superbase basicities vs that of their substituents demonstrated the insulating effect of the cyclopropenimine core. The molecular structures of several of these materials were obtained by single-crystal X-ray analysis, revealing interesting aspects of conformational bias and non-covalent organization. The types of superbasic cores and substituents were each reliably shown to affect selectivity for deprotonation over alkylation. Higher-order cyclopropenimine and guanidine superbase stability to hydrolysis was found to correlate to basicity. Finally, a GC(2) base was found to catalyze conjugate additions of alpha-aryl ester pronudeophiles, representing the first report of a neutral Bronsted base to catalyze such reactions.