105141-47-7

Upstream product

• 1199-01-5 2-phenylazlactone 
• 113474-06-9 17-<5-Oxo-2-phenyl-1,3-oxazol-4(5H)-yliden>-4-androsten-3-on-ethylendithioacetal 
• 104203-16-9 21-Acetoxy-20-benzoylamino-4,17⁽²⁰⁾-pregnadien-3-on-ethylendithioacetal 
• 113472-93-8 20-Benzoylamino-3,3-ethylendithio-4,17⁽²⁰⁾-pregnadien-21-saeure-methylester 
• 113472-92-7 20-Benzoylamino-21-hydroxy-4,17⁽²⁰⁾-pregnadien-3-on-ethylendithioacetal 
• 63910-90-7 4-Androstene-3,17-dione 3-ethylene dithioacetal 
• 104203-18-1 21-Acetoxy-20-benzoylamino-4,17⁽²⁰⁾-pregnadien-3-on 

Relevant academic research and scientific papers

New Synthesis of the Corticosterone Side-Chain

Condensation reactions between azlactone 2 and 17-ketosteroids 1 followed by opening of the azlactone ring with sodium methanolate yields methyl 20-benzoylamino-17(20)-pregnen-21-oates 6.Reduction of the ester and subsequent hydrolysis produce compounds with the corticosterone side-chain as well as a ring-closed product of new type.