A facile and efficient method for the selective deacylation of N-arylacetamides and 2-chloro-N-arylacetamides catalyzed by SOCl2
作者:Gong-Bao Wang、Lin-Fa Wang、Chao-Zhang Li、Jing Sun、Guang-Ming Zhou、Da-Cheng Yang
DOI:10.1007/s11164-011-0327-6
日期:2012.1
Thionyl chloride efficiently and selectively promoted the deacylation of N-arylacetamides and 2-chloro-N-arylacetamides, under anhydrous conditions, without effecting the ester group, aminosulfonyl group, or benzyloxyamide group. This method, which has been successfully applied to a variety of substrates including different N-arylacetamides and 2-chloro-N-arylacetamides, has the attractive advantages of inexpensive reagents, satisfactory selectivity, excellent yields, short reaction time, and convenient workup. This new method can probably be used to selectively deacylate between aromatic amides and alkyl amides.
Synthesis of tetrahalide dianions directed by crystal engineering
作者:F. Pan、R. Puttreddy、K. Rissanen、U. Englert
DOI:10.1039/c5ce01288k
日期:——
The analogy between hydrogen bonds and halogen bonds was used to synthesize the unstable [X⋯I–I⋯X]2− species by trapping I2 in the channels of macrocyclic compounds.
Competing protonation sites in sulfadiazine: answers from chemistry and electron density
作者:Fangfang Pan、Ruimin Wang、Ulli Englert
DOI:10.1039/c2ce26633d
日期:——
Sulfadiazine, a common drug, has been studied as anion in its Zn(II) salt, as a neutral compound and as hydrochloride. An unexpected protonation pattern was encountered in the cation of the latter, with a coexisting protonated anilinium and pyridinium functionality and a deprotonated amide group. Experimental charge density provides conclusive evidence about the position of the hydrogen atoms, and these results match the hydrogen bond requirements.