84985-43-3

Upstream product

• 79543-87-6 4-[(2S,3R)-3-((S)-1-Formyloxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid 4-nitro-benzyl ester 
• 77120-98-0 {(2R,3S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-acetic acid 
• 74288-37-2 4-{(2R,3S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-3-oxo-butyric acid 4-nitro-benzyl ester 
• 105995-50-4 magnesium 4-nitrobenzyl malonate 
• 78501-85-6 [(2S,3R)-3-(1-Hydroxy-ethyl)-4-oxo-azetidin-2-yl]-acetic acid 
• 77120-95-7 (2S,3R)-3-Amino-2-((S)-1-hydroxy-ethyl)-pentanedioic acid 5-benzyl ester; hydrochloride 
• 77120-97-9 {(2R,3S)-1-(tert-Butyl-dimethyl-silanyl)-3-[(S)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-acetic acid benzyl ester 
• 77120-94-6 t-4-amino-c-2-methyl-6-oxotetrahydropyran-r-3-carboxylic acid hydrochloride 
• 77120-96-8 benzyl -4-oxoazetidin-2-yl> acetate 
• 77120-92-4 (2R,3S)-3-Benzylamino-2-((R)-1-hydroxy-ethyl)-pentanedioic acid diethyl ester 
• 77120-91-3 (E)-2-Acetyl-3-benzylamino-pent-2-enedioic acid diethyl ester 
• 75321-07-2 4-[(2S,3R)-3-((R)-1-Hydroxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid 4-nitro-benzyl ester 

Downstream Products

• 64067-13-6 (5R,6S)-6-((R)-1-Hydroxy-ethyl)-3-[2-(4-nitro-benzyloxycarbonylamino)-ethylsulfanyl]-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester 
• 74288-40-7 (2S,5S,6R)-6-((S)-1-Hydroxy-ethyl)-3,7-dioxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 
• 75321-08-3 (5R,6S)-3-(Diphenoxy-phosphoryloxy)-6-((R)-1-hydroxy-ethyl)-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid 4-nitro-benzyl ester 
• 79543-87-6 4-[(2S,3R)-3-((S)-1-Formyloxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid 4-nitro-benzyl ester 
• 75321-07-2 4-[(2S,3R)-3-((S)-1-Hydroxy-ethyl)-4-oxo-azetidin-2-yl]-3-oxo-butyric acid 4-nitro-benzyl ester 
• 115859-53-5 C₃₄H₃₂N₂O₇P⁽¹⁺⁾*C₈H₁₅N₂O₄^(1-) 
• 74288-40-7 (2S,5S,6R)-6-((R)-1-Hydroxy-ethyl)-3,7-dioxo-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-nitro-benzyl ester 

Relevant academic research and scientific papers

Simple and Condensed β-Lactams. Part 9. Elaboration of the 3-(1-Hydroxyethyl) Side Chains of Potential Intermediates of Carbapenem Antibiotics via the 2-Methyl-1,3-dioxolan-2-yl Group

Deketalization of the trans compounds methyl and ethyl (2RS,3RS)-1-(2,4-dimethoxybenzyl)-3-(2-methyl-1,3-dioxolan-2-yl)-4-oxoazetidine-2-carboxylates 5b and 5c, and of the cis isomer (6b) of the latter leads to 85:15 mixtures of the trans- and cis-compounds methyl (2RS,3RS)- and (2RS,3SR)-3-acetyl-1-(2,4-dimethoxybenzyl)-4-oxoazetidine-2-carboxylate (7a) and (8a), respectively of the corresponding ethyl esters (7b) and (8b).Sodium borohydride reduction of the mixture of the trans- and cis-esters (7b) and (8b) gives a mixture of the 1'-epimeric trans-compounds ethyl(2RS,3RS)-1-(2,4-dimethoxybenzyl)-3--4-oxazetidine-2-carboxylate (9b) and (10b).Similar mixtures of 1'-epimeric compounds of the types (9) and (10), carrying a variety of substituents attached to position 2 of their azetidine rings were obtained by successive deketalization and reduction of the corresponding trans-(5) and cis-(6) compounds or their mixtures, as well as by other methods.Ring closure of a mixture of the pair of the 1'-epimeric trans-compounds p-nitrobenzyl 2-diazo-4--4-oxo-azetidin-2-yl>-3-oxobutanoates (9n) and (10n) gave a mixture of the 1'-epimeric compounds p-nitrobenzyl 6--2,7-dioxo-(3RS,5RS,6SR)-carbapenam-3-carboxylates (11) and (12) which was converted into a mixture (13) of the 1'-epimeric bis-protected thienamycin analogues p-nitrobenzyl 2-(2-formylaminoethylthio)-6--7-oxo-(5RS,6SR)-carbapen-2-em-3-carboxylates.

A PRACTICAL SYNTHESIS OF (+/-)-THIENAMYCIN

An efficient and operationally simply synthesis of (+/-)-thienamycin is described.