2-oxo-acetamidines from methyl ketones using aromatic amines and DMF as nitrogen sources is reported via copper-catalyzedC(sp3)–H amidination. Various methyl ketones react readily with aromatic amines and DMF, producing 2-oxo-acetamidines in yields of 47 to 92%. This protocol features the simultaneous formation of C–N and CN bonds using DMF and aromatic amines as two different nitrogen sources. It
Change of the favored routes of EI MS fragmentation when proceeding from N1, N1-dimethyl-N2-arylformamidines to 1,1,3,3-tetraalkyl-2-arylguanidines: substituent effects
作者:Ewa D. Raczyńska、Mariusz Makowski、Jean-François Gal、Pierre-Charles Maria
DOI:10.1002/jms.1766
日期:——
ormamidines and of 1,1,3,3‐tetraalkyl‐2‐arylguanidines are structurally analogous and similar electron‐ionization mass spectral fragmentation may be expected, they display important differences in the favored routes of fragmentation and consequently in substituenteffects on ion abundances. In the case of formamidines, the cyclization‐elimination process (initiated by nucleophilic attack of the N‐amino
Reductive Monoalkylation of Aromatic Amines via Amidine Intermediates
作者:Jianxing Zhang、Hui-Min Chang、Robert R. Kane
DOI:10.1055/s-2001-13378
日期:——
The convenience and efficiency of using amidines as intermediates in the reductive monoalkylation of aromatic amines has been demonstrated. This monoalkylation can be performed as either a two-step synthesis or a one-pot procedure. Several examples are presented which clearly demonstrate the utility of this new method for the methylation or ethylation of aromatic amines, including unprotected nucleosides.
phosphorus trichloride, the sterically least encumbered formamidine gave a stable two-coordinate compound through the formation of an intermediate tris(phosphane). The reactions of the sterically more encumbered formamidines led to the substitution of only two chlorine atoms to give a chlorophosphane or benzazaphosphole. The structures of key compounds were proven by X-ray crystal structure analyses.
Novel synthesis of 1-substituted-4-imidazolecarboxylates via solvent-free cycloaddition reaction between formamidines and isocyanides
作者:Han Cao、Fu-sheng Bie、Xue-jing Liu、Ying Han、Jie Ma、Yi-jun Shi、Peng Yan、Chao-yue Sun、Hai-meng Wang
DOI:10.1016/j.tet.2020.131205
日期:2020.5
A simple and efficient protocol for cyclization between formamidines and ethyl isocyanoacetate has been described in the absence of metal catalyst and solvent. A series of 1-substituted-4-imidazolecarboxylates were synthesized in moderate to good yields with DABCO as base additive.