85090-85-3

Upstream product

• 85090-82-0 (3RS,4SR)-4-ethynyl-1-(4-methoxymethoxyphenyl)-3-phenoxyacetamidoazetidin-2-one 
• 99284-70-5 (3RS,4SR)-1-(4-methoxymethoxyphenyl)-3-phenoxyacetamido-4-trimethylsilylethynylazetidin-2-one 
• 99284-72-7 (3RS,4SR)-1--4-ethynyl-3-phenoxyacetamidoazetidin-2-one 
• 99300-03-5 Chloro-[(2R,3S)-2-ethynyl-4-oxo-3-(2-phenoxy-acetylamino)-azetidin-1-yl]-acetic acid benzyl ester 
• 85090-86-4 (3RS,4SR)-4-ethynyl-3-phenoxyacetamidoazetidin-2-one 
• 85090-84-2 (3bRS,4RS,7SR)-benzyl 4,5-dihydro-5-oxo-4-phenoxyacetamido-3bH-azeto<1',2':3,4>imidazo<1,5-c>-v-triazole-7-carboxylate 

Relevant academic research and scientific papers

Synthesis of Novel Fused β-Lactams by Intramolecular 1,3-Dipolar Cycloadditions. Part 7. (9RS,9aRS)-9,9a-Dihydro-5-methyl-8-oxo-9-phenoxyacetamido-8H-azeto-v-triazolopyrazine-6-carboxylic Acids and (3bRS,4RS,7SR)-4,5-Dihydro-5-oxo-4-phenoxya

Addition of the mixed anhydride derived from azidoacetic acid and trifluoroacetic anhydride to benzyl 2-(N-phenylpropynylideneamino)-3,3-ethylenedioxybutanoate (9) in the presence of triethylamine afforded (3RS,4SR)-3-azido-1-(1-benzyloxycarbonyl-2,2-ethy