90244-15-8

Upstream product

• 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 
• 90211-51-1 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-hydroxymethyl)-azetidin-2-one 
• 90211-52-2 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy)-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-chloromethyl)azetidin-2-one 
• 130792-99-3 (S)-2-((2R,3R)-1-Benzhydryloxyoxalyl-3-benzoylamino-4-oxo-azetidin-2-yloxy)-propionic acid ethyl ester 
• 90244-12-5 (3R,4R)-4-{(1R)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-2-methylprop-1-enyl)azetidin-2-one 
• 90211-50-0 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-2-methylprop-1-enyl)-azetidin-2-one 
• 130675-27-3 [(2R,3R)-3-Benzoylamino-2-((S)-2-ethoxycarbonyloxy-1-methyl-2-oxo-ethoxy)-4-oxo-azetidin-1-yl]-(triphenyl-λ⁵-phosphanylidene)-acetic acid benzhydryl ester 
• 90244-27-2 (3R,4R)-4-{(1S)-1-ethoxycarbonylethoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 90244-29-4 (3R,4R)-4-{(1S)-3-diazo-2-oxo-1-methylpropoxy}-3-benzamido-1-(1-diphenylmethoxycarbonyl-1-triphenylphosphoranylidenemethyl)azetidin-2-one 
• 90244-30-7 (3R,4R)-4-{(1S)-3-chloro-2-oxo-1-methylpropoxy}-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 

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.