A series of trans-3-chloro-β-lactams was synthesized stereospecifically from imines and chloroacetyl chloride or a mixture of chloroacetyl chloride and nitroacetyl chloride, prepared from vinylidene chloride and a mi...A series of trans-3-chloro-β-lactams was synthesized stereospecifically from imines and chloroacetyl chloride or a mixture of chloroacetyl chloride and nitroacetyl chloride, prepared from vinylidene chloride and a mixture of concentrated nitric acid and sulfuric acid, in the presence of triethylamine. The reaction of vinylidene chloride and the mixed acid was investigated. The formation mechanism of chloroacetyl chloride and nitroacetyl chloride and their reaction process with imines were proposed.展开更多
A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butyl...A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butylcalix\arene. It was found that the bridging reaction is selectively, at least, preferably at 1,3\|position for p \|tert\|butylcalix\arene and p \|tert\|b utylcalix\arene, 1,5\|position for p \|tert \|butylcalix\arene. Taking the yield of bridged calixarene as a comparsion standard, the activity decreases with the increasing of the number of phenolic units in calixarene.展开更多
基金Supported by the National Natural Science Foundation of China(Nos.20772005,20972013)the Beijing Natural Science Foundation,China(No.2092022)the Specialized Research Fund for the Doctoral Program of Higher Education,Ministry of Education of China
文摘A series of trans-3-chloro-β-lactams was synthesized stereospecifically from imines and chloroacetyl chloride or a mixture of chloroacetyl chloride and nitroacetyl chloride, prepared from vinylidene chloride and a mixture of concentrated nitric acid and sulfuric acid, in the presence of triethylamine. The reaction of vinylidene chloride and the mixed acid was investigated. The formation mechanism of chloroacetyl chloride and nitroacetyl chloride and their reaction process with imines were proposed.
文摘A new bridging reagent, N,N ′\|bis(chloroacetyl)propylenediamine was used to explore the relative activity and bridging pattern of p \|tert\|buty lcalix\arene, p \|tert\|buty lcalix\arene and butylcalix\arene. It was found that the bridging reaction is selectively, at least, preferably at 1,3\|position for p \|tert\|butylcalix\arene and p \|tert\|b utylcalix\arene, 1,5\|position for p \|tert \|butylcalix\arene. Taking the yield of bridged calixarene as a comparsion standard, the activity decreases with the increasing of the number of phenolic units in calixarene.