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Upstream product

• 86978-81-6 (3R,4R)-4-acetoxy-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-1-trimethylsilyl-2-azetidinone 
• 88669-70-9 (3S,4R)-3-<(1R)-1-<(tert-Butyldimethylsilyl)oxy>ethyl>-4-(carboxymethyl)azetidin-2-one 
• 92133-50-1 C₃₉H₅₄N₅O₁₄PSSi 
• 92133-40-9 [(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2-((S)-1-{1-[(E)-4-nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-ylsulfanylcarbonylmethyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid 4-nitro-benzyl ester 
• 98167-71-6 [(2R,3S)-2-((S)-1-{1-[(E)-4-Nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-ylsulfanylcarbonylmethyl)-4-oxo-3-((R)-1-trimethylsilanyloxy-ethyl)-azetidin-1-yl]-oxo-acetic acid 4-nitro-benzyl ester 
• 92133-41-0 [(2R,3S)-3-((R)-1-Hydroxy-ethyl)-2-((S)-1-{1-[(E)-4-nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-ylsulfanylcarbonylmethyl)-4-oxo-azetidin-1-yl]-oxo-acetic acid 4-nitro-benzyl ester 
• 98167-65-8 {(2R,3S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-thioacetic acid S-((S)-1-{1-[(Z)-4-nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-yl) ester 
• 87392-18-5 <3S-<3α(S^*),4β>>-benzyl<3-(1-t-butyldimethylsilyloxyethyl)-2-azetidinone-4-yl>acetate 
• 76899-07-5 (3R,4R)-3-[(R)-1-(tert-butyldimethylsilyloxy)ethyl]-4-acetoxyazetidin-2-one 
• 98167-74-9 (5R,6S)-3-((S)-1-{1-[(E)-4-Nitro-benzyloxycarbonylimino]-ethyl}-pyrrolidin-3-ylsulfanyl)-7-oxo-6-((R)-1-trimethylsilanyloxy-ethyl)-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester 

Relevant academic research and scientific papers

AN EFFICIENT CARBAPENEM SYNTHESIS VIA AN INTRAMOLECULAR WITTIG REACTION OF NEW TRIALKOXYPHOSPHORANE-THIOLESTERS

New trialkoxyphosphorane-thiolesters 10, obtained by reaction of oxalimides 9 with trialkyl phosphite, were efficiently cyclized by an intramolecular Wittig reaction to give carbapenems 11.