A polymer-Supported [1,3,2]Oxazaphospholidine for the conversion of isothiocyanates to isocyanides and Their subsequent use in an ugi reaction
摘要:
The design and synthesis of a new polymer supported reagent for the clean conversion of isothiocyanates to isocyanides under microwave conditions was accomplished. The structurally diverse isocyanides generated were used in an Ugi 3CC, allowing the rapid generation of 2-isoindolinone-7-carboxamide analogues. (C) 2002 Elsevier Science Ltd. All rights reserved.
The selective addition of organomagnesium reagents to 2,4,6‐trichlorophenyl isocyanide leading to magnesiated aldimines is reported. These aldimines react with Weinreb amides, ketones, or carbonates to provide the corresponding carbonyl derivatives after acidic cleavage. This allows for an efficient synthesis of 1,2‐dicarbonyl compounds and α‐hydroxy ketones.
Synthesis of imides <i>via</i> palladium-catalyzed three-component coupling of aryl halides, isocyanides and carboxylic acids
作者:Bo Wang、Dan He、Beige Ren、Tuanli Yao
DOI:10.1039/c9cc08438j
日期:——
A palladium-catalyzed three-component synthesis of acyclic imides from feedstock arylhalides, carboxylic acids and isocyanides through the intermediacy of isoimides has been developed. The key to the success of this approach was controlled isocyanide slow addition and organic/aqueous biphasic conditions. This transition-metal-catalyzed approach features readily available starting materials, atom-
silver‐catalyzed chemoselective [4+2] annulation of aryl and heteroaryl isocyanides with α‐substituted isocyanoacetamides was developed for the facile and efficient synthesis of 2‐aminoquinolones, naphthyridines, and phenanthrolines. A mechanism for this multistep domino reaction is proposed on the basis of a 13C‐labeling experiment, according to which an unprecedented chemoselective heterodimerization
Synthesis of sugar-derived isoselenocyanates, selenoureas, and selenazoles
作者:Óscar López、Susana Maza、Víctor Ulgar、Inés Maya、José G. Fernández-Bolaños
DOI:10.1016/j.tet.2009.01.038
日期:2009.3
Aryl, alkyl, and sugar-derived isoselenocyanates were prepared by a one-pot procedure starting from the corresponding formamides, using triphosgene as a dehydrating agent, triethylamine, and black selenium powder. The preparation of sugar selenoureas by coupling of O-protected sugar-derived isoselenocyanates with different amines, and by coupling of unprotected glycopyranosyl amines with phenyl isoselenocyanate
Palladium-catalyzed Ugi-type reaction of 2-iodoanilines with isocyanides and carboxylic acids affording <i>N</i>-acyl anthranilamides
作者:Tuanli Yao、Bo Wang、Beige Ren、Xiangyang Qin、Tao Li
DOI:10.1039/d1cc01226f
日期:——
The first palladium-catalyzed Ugi-type multicomponent reaction for the synthesis of N-acyl anthranilamides from isocyanides, 2-iodoanilines and carboxylic acids has been developed. This method provides expeditious and highly efficient access to structurally diverse N-acyl anthranilamides from readily available starting materials with good functional group compatibility. The utility of this method has