Transition-Metal-Free Conversion of Trifluoropropanamides into Cyanoformamides through C–CF3 Bond Cleavage and Nitrogenation
摘要:
w A new transition-metal-free transformation of trifluoropropanamides into cyanoformamides through a sequence of C-CF3 bond cleavage and nitrogenation using tert-butyl nitrite as the nitrogen source,is described. The method features direct detrifluoromethylation, broad substrate scopes, and excellent selectivity control, representing a new shortcut for constructing the nitrile group involving C-CF3 sigma-bond cleavage.
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
Unexpected Zirconium-Mediated Multicomponent Reactions of Conjugated 1,3-Butadiynes and Monoynes with Acyl Cyanide Derivatives
作者:Shasha Yu、Xu You、Yuanhong Liu
DOI:10.1002/chem.201202607
日期:2012.10.29
Going ber(zirc): Zirconium–butadiyne complexes react with acylcyanidederivatives through diverse reaction pathways. The complexes react with two molecules of carbamoyl cyanide to form 1,4‐benzodiazepin‐2‐one‐derivatives containing azazirconacycles. Reactions with either aroyl cyanides or alkyl cyanoformates lead to azazirconacyclopentenes containing a quaternary carbon center.
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)。
Kobler,H. et al., Justus Liebigs Annalen der Chemie, 1978, p. 1946 - 1962