130675-27-3

Upstream product

• 90211-50-0 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-2-methylprop-1-enyl)-azetidin-2-one 
• 90244-12-5 (3R,4R)-4-{(1R)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-2-methylprop-1-enyl)azetidin-2-one 
• 130792-99-3 (S)-2-((2R,3R)-1-Benzhydryloxyoxalyl-3-benzoylamino-4-oxo-azetidin-2-yloxy)-propionic acid ethyl ester 
• 90211-52-2 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy)-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-chloromethyl)azetidin-2-one 
• 90211-51-1 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-hydroxymethyl)-azetidin-2-one 
• 90244-27-2 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 90244-28-3 (3R,4R)-4-{(1S)-1-carboxyethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 541-41-3 chloroformic acid ethyl ester 
• 90211-52-2 (3R,4R)-4-{(1R)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-chloromethyl}azetidin-2-one 
• 90211-53-3 (3R,4R)-4-{(1R)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 90211-54-4 (3R,4R)-4-{(1R)-1-carboxyethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 

Downstream Products

• 130675-28-4 [(2R,3R)-2-((R)-3-Acetoxy-1-methyl-2-oxo-propoxy)-3-benzoylamino-4-oxo-azetidin-1-yl]-(triphenyl-λ⁵-phosphanylidene)-acetic acid benzhydryl ester 
• 90211-62-4 (3R,4R)-4-{(1R)-3-(2-methyl-1,3,4-thiadiazole-5-yl)thio-2-oxo-1-methylpropoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 90318-96-0 {(2R,3R)-3-Benzoylamino-2-[(R)-1-methyl-3-(1-methyl-1H-tetrazol-5-ylsulfanyl)-2-oxo-propoxy]-4-oxo-azetidin-1-yl}-(triphenyl-λ⁵-phosphanylidene)-acetic acid benzhydryl ester 
• 130793-06-5 (4R,6R,7R)-3-Acetoxymethyl-7-benzoylamino-4-methyl-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 90211-63-5 (4R,6R,7R)-7-Benzoylamino-4-methyl-3-(5-methyl-[1,3,4]thiadiazol-2-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 90211-58-8 (4R,6R,7R)-7-Benzoylamino-4-methyl-3-(1-methyl-1H-tetrazol-5-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 130675-30-8 (5S,7R,8R)-8-Benzoylamino-5-methyl-4,9-dioxo-6-oxa-1-aza-bicyclo[5.2.0]non-2-ene-2-carboxylic acid benzhydryl ester 
• 90244-30-7 (3R,4R)-4-{(1S)-3-chloro-2-oxo-1-methylpropoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 130675-28-4 [(2R,3R)-2-((S)-3-Acetoxy-1-methyl-2-oxo-propoxy)-3-benzoylamino-4-oxo-azetidin-1-yl]-(triphenyl-λ⁵-phosphanylidene)-acetic acid benzhydryl ester 
• 130793-04-3 {(2R,3R)-3-Benzoylamino-2-[(S)-1-methyl-3-(5-methyl-[1,3,4]thiadiazol-2-ylsulfanyl)-2-oxo-propoxy]-4-oxo-azetidin-1-yl}-(triphenyl-λ⁵-phosphanylidene)-acetic acid benzhydryl ester 
• 90211-61-3 (3R,4R)-4-{(1S)-3-(1-methyl-1H-tetrazole-5-yl)thio-2-oxo-1-methylpropoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)-azetidin-2-one 
• 130793-07-6 (4S,6R,7R)-7-Benzoylamino-3-chloromethyl-4-methyl-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 130675-29-5 (4S,6R,7R)-3-Acetoxymethyl-7-benzoylamino-4-methyl-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 
• 130793-05-4 (4S,6R,7R)-7-Benzoylamino-4-methyl-3-(5-methyl-[1,3,4]thiadiazol-2-ylsulfanylmethyl)-8-oxo-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 

Relevant academic research and scientific papers

NOVEL 2-METHYL-1-OXACEPHALOSPORINS 2. SYNTHESIS OF 3-SUBSTITUTED 2-METHY-1-OXACEPHEM NUCLEUS

The stereoselective syntheses of 3-substituted 2α- and 2β-methyl-1-oxacephems have been achieved through the intramolecular Wittig condensation of 4-(1-methylpropoxy)azetidinones.