A Practical and General Amidation Method from Isocyanates Enabled by Flow Technology
作者:Jason D. Williams、William J. Kerr、Stuart G. Leach、David M. Lindsay
DOI:10.1002/anie.201807393
日期:2018.9.10
The addition of carbonnucleophiles to isocyanates represents a conceptually flexible and efficient approach to the preparation of amides. This general synthetic strategy has, however, been relatively underutilized owing to narrow substrate tolerance and the requirement for less favourable reaction conditions. Herein, we disclose a high‐yielding, mass‐efficient, and scalable method with appreciable
Facile Synthesis of Sterically Hindered and Electron-Deficient Secondary Amides from Isocyanates
作者:Gabriel Schäfer、Coraline Matthey、Jeffrey W. Bode
DOI:10.1002/anie.201204481
日期:2012.9.3
The big easy: The direct coupling of Grignard reagents to isocyanates provides a facile and robust solution for the synthesis of sterically hindered and electron‐deficient secondary amides. The products are obtained in high yields without the need for excess reagents or chromatographic purification.
作者:Pieter Mampuys、Eelco Ruijter、Romano V. A. Orru、Bert U. W. Maes
DOI:10.1021/acs.orglett.8b01654
日期:2018.7.20
The synthesis of secondary amides from readily accessible and bench-stable substituted S-phenyl thiocarbamates and Grignard reactants is reported. Oxidative workup allows recycling of the thiolate leaving group as diphenyl disulfide. Diphenyl disulfide can be transformed into S-phenyl benzenethiosulfonate, a reactant required for thiocarbamate synthesis. This amide synthesis is suitable for the preparation
This application discloses compounds according to generic Formula I:
wherein the variables are defined as described herein, and which inhibit Btk. The compounds disclosed herein are useful to modulate the activity of Btk and treat diseases associated with excessive Btk activity. The compounds are further useful to treat inflammatory and auto immune diseases associated with aberrant B-cell proliferation, such as rheumatoid arthritis. Also disclosed are compositions containing compounds of Formula I and at least one carrier, diluent or excipient.
Unusual reactivity of isocyanates with dioxo- and diimidomolybdenum(VI) complexes
作者:Richard Lai、Sylvain Mabille、Alain Croux、Sylvie Le Bot
DOI:10.1016/s0277-5387(00)80213-2
日期:1991.1
Phenyl isocyanate reacts with dioxo- and diimidomolybdenum(VI) complexes such as Mo(O)2(mes)2 (1) (mes = mesityl = 2,4,6-C6H2Me3), Mo(mes)2CH2PBu3(O)2 (2), Mo(mes)CPBu3(mes)}(O)2(3) and Mo(NBu(t))2(mes)2 (4), selectively affording phenyl mesityl amide. This reaction proceeds via insertion into the Mo-mesityl bond, leading to an unstable oxazamolydenacycle which has been identified by C-13 NMR. This intermediate is probably hydrolysed with generation of the amide during chromatographic work-up.