21432-74-6

Upstream product

• 84-36-6 syrosingopine 
• 50-55-5 reserpine 

Downstream Products

• 2903-84-6 ent-18α-(4-acetoxy-3,5-dimethoxy-benzoyloxy)-11,17β-dimethoxy-15β-yohimban-16α-carboxylic acid methyl ester 
• 2815-01-2 ent-18α-(4-ethylcarbamoyloxy-3,5-dimethoxy-benzoyloxy)-11,17β-dimethoxy-15β-yohimban-16α-carboxylic acid methyl ester 
• 1535202-81-3 methyl (1R,15S,17R,18R,19S,20S)-17-[(3,5-dimethoxy-4 {[(pyridin-4-ylmethoxy)carbonyl]oxy}phenyl)carbonyloxy]-6,18-dimethoxy-3,13-diazapentacyclo[11.8.0.0^2,10.0^4,9.0^15,20]henicosa-2⁽¹⁰⁾,4,6,8-tetraene-19-carboxylate 
• 1535202-96-0 methyl (1R,15S,17R,18R,19S,20S)-17-{[4-(butanoyloxy)-3,5-dimethoxyphenyl]carbonyloxy}-6,18-dimethoxy-3,13-diazapentacyclo[11.8.0.0^2,10.0^4,9.0^15,20]henicosa-2⁽¹⁰⁾,4,6,8-tetraene-19-carboxylate 
• 1535202-97-1 methyl (1R,15S,17R,18R,19S,20S)-17-({3,5-dimethoxy-4-[(2-phenylacetyl)oxy]phenyl}carbonyloxy)-6,18-dimethoxy-3,13-diazapentacyclo[11.8.0.0^2,10.0^4,9.0^15,20]henicosa-2⁽¹⁰⁾,4,6,8-tetraene-19-carboxylate 
• 1535203-20-3 C₄₀H₄₄N₂O₁₂ 
• 1535203-22-5 C₄₀H₄₅N₃O₁₁ 

Relevant academic research and scientific papers

PROCESS FOR REGIOSELECTIVE DEMETHYLATION OF P-METHOXY GROUP IN PHENOLIC ESTER AND DIARYL KETONE MOIETIES

Demethylation of 3′,4′-dimethoxy or 3′,4′,5′-trimethoxy benzoic ester of a phenol is carried out in the presence of an excess of aluminum halide in an organic solvent to get 4′-Hydroxy, 3′-methoxy or 4′ hydroxy, 3′,5′-dimethoxy benzoic acid ester of a phe