نتایج جستجو برای: Preparation of cis-(3-azido-4-styryl)-2-azetidinone
تعداد نتایج: 21671370 فیلتر نتایج به سال:
the synthesis of the title compound is described. deprotection of cis(n-trityl-3-azido-4-styryl)-2-azetidinone to cis-(3-azido-4-styryl)-2-azetidinone was found to be accelerated by the special salt effect under acidic condition
The synthesis of the title compound is described. Deprotection of Cis(N-Trityl-3-azido-4-Styryl)-2-azetidinone to Cis-(3-azido-4-styryl)-2-azetidinone was found to be accelerated by the special salt effect under acidic condition
The title compound has been synthesized starting from cis- N- (a - methylacrylyl) -3-N- Phenylacetamido -4- styryl -2- azetidinone (1) [1].
the synthesis of cis-n-[a-carbobenzyloxy-b-(p-hydroxyphenyl)ethyl]-3-phthalimido-4-styryl-2-azetidinone is described. we have found that the electron-rich schiff bases can afford the cis-b-lactam ring even in the presence of the free hydroxyl functions. the mechanisms of cis and trans-b-lactam ring formation are discussed. the discussions are consistent with the recent publications.
The synthesis of cis-N-[a-carbobenzyloxy-b-(p-hydroxyphenyl)ethyl]-3-phthalimido-4-styryl-2-azetidinone is described. We have found that the electron-rich Schiff bases can afford the cis-b-lactam ring even in the presence of the free hydroxyl functions. The mechanisms of cis and trans-b-lactam ring formation are discuss...
we describe here a suitable approach for the synthesis of n-unsubstituted monocyclic b-lactams under mild reaction conditions by the annelation of imines with substituted acetylchlorides. in this method the reaily available phtalimidoacetyl chloride were allowed to react with - dibenzylideneiminotoluene (hydrobenzamide) in the presence of an equimolar amount of triethylamine in refluxing toluen...
Within this work, a modified preparation of diethyl 4-azidobenzylphosphonate (L1) is presented and the family 4- or 4′-azido-substituted aromatic phosphonate esters increased by three new ligand platforms: diisopropyl (L2), ((4′-azido-[1,1′-biphenyl]-4-yl)methyl)phosphonate (L3), 4-azido-2,3,5,6-tetrafluorobenzylphosphonate (L4), which exhibit an anomalous splitting N3 stretching vibrations. Su...
Based on a literature precedent, preparation of methyl 4-azido-3,4,6-trideoxy-3-fluoro-alpha-D-mannopyranoside (18) was attempted via fluorination of methyl 4-azido-2-O-benzyl-4,6-dideoxy-alpha-D-altropyranoside with diethylaminosulfur trifluoride (DAST). Contrary to expectations, the reaction took place with retention of configuration at the site of the fluorination yielding methyl 4-azido-2-O...
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