131533-95-4

Upstream product

• 131533-85-2 [(3S,4R)-3-Benzoylamino-2-oxo-4-(2-phenylsulfanylcarbonyl-ethyl)-azetidin-1-yl]-acetic acid 4-nitro-benzyl ester 
• 110289-29-7 (3S,4R)-3-amino-4-[2-(furan-2-yl)ethyl]azetidin-2-one 
• 131533-64-7 [(2R,3S)-3-Benzoylamino-2-(2-furan-2-yl-ethyl)-4-oxo-azetidin-1-yl]-acetic acid 4-nitro-benzyl ester 
• 131533-74-9 3-[(2R,3S)-3-Benzoylamino-1-(4-nitro-benzyloxycarbonylmethyl)-4-oxo-azetidin-2-yl]-propionic acid 
• 99333-65-0 1-benzyl-3β-((S)-2-oxo-4-phenyloxazolidin-3-yl)-4β-[2-(2-furyl)ethyl]azetidin-2-one 
• 131548-72-6 N-[(2R,3S)-2-(2-Furan-2-yl-ethyl)-4-oxo-azetidin-3-yl]-benzamide 

Relevant academic research and scientific papers

Synthesis of carbacephem antibiotics: Synthesis via Dieckmann reaction using phenyl esters to direct the regioselectivity of the cyclization

β-Ketoesters useful for elaboration to carbacephems were synthesized from a variety of enantiomerically pure diesters. Use of phenyl esters to direct the regioselectivity was demonstrated.