nickel/Lewis acid (LA) cooperative catalysis to give beta-cyano-substituted acrylates and acrylamides, respectively, in highly stereoselective and regioselective manners. The resulting adducts serve as versatile synthetic building blocks through chemoselective transformations of the ester, amide, and cyano groups as demonstrated by the synthesis of typical structures of beta-cyano ester, beta-amino
Solvent-Free Synthesis of Cyanoformamides from Carbamoyl Imidazoles
作者:Jeremy Nugent、Sarah G. Campbell、Yen Vo、Brett D. Schwartz
DOI:10.1002/ejoc.201700974
日期:2017.9.15
Secondary and tertiary cyanoformamides have been synthesized with a solvent-free approach from carbamoyl imidazoles and TMSCN. This method negates the need to use large excesses of toxic reagents and is amenable to large-scale synthesis.
The B12 derivative, heptamethyl cobyrinate, -mediated electrochemicalsynthesis of cyanoformamides has been developed. Aerobic oxygenation of the carbon-centered radical initiated in situ generation of the reactive acyl chloride intermediate, which led to cyanoformamides in the presence of an amine. This one-pot and scalable synthetic method has been demonstrated with 41 examples up to 94% yields with
Diverse Reactivity of Zirconacyclocumulenes Derived from Coupling of Benzynezirconocenes with 1,3-Butadiynes towards Acyl Cyanides: Synthesis of Indeno[2,1-<i>b</i>]pyrroles or [3]Cumulenones
作者:Xiaoping Fu、Jingjin Chen、Guangyu Li、Yuanhong Liu
DOI:10.1002/anie.200900951
日期:2009.7.13
Versatility: Cycloaddition of carbamoyl cyanides to 1,3‐butadiynes via seven‐membered zirconacyclocumulenes yields dihydroindeno[2,1‐b]pyrroles (see scheme, right); a C(sp2)H bond on the aromatic substituent of the 1,3‐butadiyne reactant is activated in the process. In contrast, reactions with aryl or alkyl acylcyanides provide a stereoselective route to cis‐[3]cumulenones (left).
通用性:氨基甲酰氰经七元氧化锆环枯烯环加成成1,3-丁二炔产生二氢茚并[2,1- b ]吡咯(见方案右)。一个C(SP 2) H于1,3-丁二炔反应物的芳族取代基键在该过程中被激活。相反,与芳基或烷基酰基氰的反应提供了到顺式[[3]]枯烯酮的立体选择路线(左)。