68751-06-4

Upstream product

• 64370-33-8 [(2R)-2r-acetylsulfanyl-4-oxo-3c-(2-phenoxy-acetylamino)-azetidin-1-yl]-(triphenyl-λ⁵-phosphanylidene)-acetic acid 4-nitro-benzyl ester 
• 64370-33-8 [(2R,3S)-2-Acetylsulfanyl-4-oxo-3-(2-phenoxy-acetylamino)-azetidin-1-yl]-(triphenyl-λ⁵-phosphanylidene)-acetic acid 4-nitro-benzyl ester 
• 117509-25-8 sodium 5-methylthiazole-4-carboxylate 
• 100-11-8 1-bromomethyl-4-nitro-benzene 
• 85621-51-8 (2S,5R,6S)-6-Amino-6-methoxy-3,3-dimethyl-7-oxo-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 
• 64370-37-2 [(2R,3S)-2-Acetylsulfanyl-4-oxo-3-(2-phenoxy-acetylamino)-azetidin-1-yl]-hydroxy-acetic acid 4-nitro-benzyl ester 
• 117509-16-7 p-nitrobenzyl 6α-methoxy-6β-<α-(p-nitrobenzyloxycarbonyl)phenylacetamido>penicillanate-1β oxide 
• 117509-20-3 (E)-2-{(2R,3S)-2-(Benzothiazol-2-yldisulfanyl)-3-methoxy-3-[2-(4-nitro-benzyloxycarbonyl)-2-phenyl-acetylamino]-4-oxo-azetidin-1-yl}-3-hydroxy-but-2-enoic acid 4-nitro-benzyl ester 
• 117509-19-0 2-{(2R,3S)-2-(Benzothiazol-2-yldisulfanyl)-3-methoxy-3-[2-(4-nitro-benzyloxycarbonyl)-2-phenyl-acetylamino]-4-oxo-azetidin-1-yl}-3-methyl-but-3-enoic acid 4-nitro-benzyl ester 
• 117509-21-4 (E)-3-Methanesulfonyloxy-2-{(1R,5R)-1-methoxy-3-[(4-nitro-benzyloxycarbonyl)-phenyl-methyl]-7-oxo-4-oxa-2,6-diaza-bicyclo[3.2.0]hept-2-en-6-yl}-but-2-enoic acid 4-nitro-benzyl ester 
• 117509-14-5 p-nitrobenzyl 6α-methoxy-6β-<α-(p-nitrobenzyloxycarbonyl)phenylacetamido>penicillanate 
• 73707-59-2 p-nitrobenzyl 6-p-toluenesulfenylimidopenicillinate 
• 117509-22-5 (E)-2-{(2S,3S)-2-Chloro-3-methoxy-3-[2-(4-nitro-benzyloxycarbonyl)-2-phenyl-acetylamino]-4-oxo-azetidin-1-yl}-3-methanesulfonyloxy-but-2-enoic acid 4-nitro-benzyl ester 

Relevant academic research and scientific papers

CONTRASTING THERMAL BEHAVIOUR OF DIASTEREOISOMERIC 4-ACETYLTHIO-3-ACYLAMINO-1-(α-TRIPHENYLPHOSPHORANYLIDENE)ALKOXYCARBONYLMETHYLAZETIDIN-2-ONES

Under conditions in which cis isomers of the title compounds are converted into 6β-acylamino-2-methylpenem-3-carboxylates, trans isomers afford thiazole-4-carboxylates and 2-alkyloxazolin-5-ones.