872094-48-9

Upstream product

• 872094-47-8 8-hydroxy-13-(3-methyl-butyrylamino)-2-oxo-11-phenyl-10-oxa-6-thia-3,12-diaza-tricyclo[7.3.1.0^3,7]tridec-11-ene-4-carboxylic acid methyl ester 
• 108-24-7 acetic anhydride 
• 872094-45-6 2-amino-3-azido-4-oxo-octahydro-1-oxa-7-thia-4a-aza-cyclopropa[e]azulene-5-carboxylic acid methyl ester 
• 872094-37-6 4-oxo-3-trifluoromethanesulfonyloxy-1a,4,5,6,7a,7b-hexahydro-1-oxa-7-thia-4a-aza-cyclopropa[e]azulene-5-carboxylic acid methyl ester 
• 872094-46-7 3-azido-2-(3-methyl-butyrylamino)-4-oxo-octahydro-1-oxa-7-thia-4a-aza-cyclopropa[e]azulene-5-carboxylic acid methyl ester 
• 872094-42-3 2-amino-4-oxo-3-trifluoromethanesulfonyloxy-octahydro-1-oxa-7-thia-4a-aza-cyclopropa[e]azulene-5-carboxylic acid methyl ester 
• 108-12-3 isopentanoyl chloride 
• 221143-53-9 (3R,6S,7S,8S,9R,9aR)-methyl octahydro-6,7,8,9-tetrahydroxy-5-oxothiazolo[3,2-a]azepine-3-carboxylate 

Downstream Products

• 872094-49-0 9-acetoxy-6-benzoylamino-8-hydroxy-7-(3-methyl-butyrylamino)-5-oxo-octahydro-thiazolo[3,2-a]azepine-3-carboxylic acid methyl ester 

Relevant academic research and scientific papers

Regioselective conversion of the secondary hydroxyl groups of D-glucuronic acid without the requirement of O-protecting groups

Trifluoromethanesulfonic acid anhydride (triflic acid anhydride) transforms the bicyclic thiazolidinlactam 1a into the crystalline elimination product 2, in which all four secondary hydroxyl groups of la are differently functionalized. Compound 2 can then