78905-44-9

Upstream product

• 5292-43-3 bromoacetic acid tert-butyl ester 
• 59461-72-2 (3R,4R)-4-methylthio-3-triphenylmethylaminoazetidin-2-one 
• 72819-38-6 t-butyl (3R,4R)-2-(4-methylthio-2-oxo-3-triphenylmethylaminoazetidin-1-yl)acetate 
• 72819-39-7 t-butyl (3S,4R)-2-(4-azido-2-oxo-3-triphenylmethylaminoazetidin-1-yl)acetate 

Downstream Products

• 78905-45-0 (1S,7bR)-2-Oxo-3-phenylselanyl-1-(trityl-amino)-1,3,4,7b-tetrahydro-2H-2a,6,7,7a-tetraaza-cyclobuta[e]indene-3-carboxylic acid tert-butyl ester 
• 78905-46-1 t-butyl (8S,8aR)-7,8-dihydro-7-oxo-8-triphenylmethylamino-8aH-azeto<1,2-a>-v-triazolo<3,4-c>pyrimidine-5-carboxylate 
• 80299-99-6 (1S,7bR)-1-Amino-2-oxo-1,7b-dihydro-2H-2a,6,7,7a-tetraaza-cyclobuta[e]indene-3-carboxylic acid tert-butyl ester; compound with toluene-4-sulfonic acid 

Relevant academic research and scientific papers

Synthesis of Novel Fused &β-Lactams by Intramolecular 1,3-Dipolar Cycloadditions. Part 2. (8S,8aR)-7,8-Dihydro-7-oxo-8-phenoxyacetamido-8aH-azeto-v-triazolopyrimidine-5-carboxylic Acids

The penicillin-derived (3R,4R)-4-methylthio-3-triphenylmethylaminoazetidin-2-one (10) has been converted into (3S,4R)-4-azido-1-(1-t-butoxycarbonylbut-3-ynyl)-3-triphenylmethylaminoazetidin-2-one (15a), which provided t-butyl (8S,8aR)-4,5,7,8-tetrahydro-7