(R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

Base Information

• Chemical Name: (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester
• CAS No.: 178484-40-7
• Molecular Formula: C₂₀H₂₃BrN₂O₆
• Molecular Weight: 467.316
• Mol file: 178484-40-7.mol

Synonyms:(R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

Chemical Property of (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

Chemical Property:

Purity/Quality:

Safty Information:

• Pictogram(s):  
• Hazard Codes: 

MSDS Files:

Useful:

Technology Process of (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

There total 1 articles about (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester which guide to synthetic route it. The literature collected by LookChem mainly comes from the sharing of users and the free literature resources found by Internet computing technology. We keep the original model of the professional version of literature to make it easier and faster for users to retrieve and use. At the same time, we analyze and calculate the most feasible synthesis route with the highest yield for your reference as below:

synthetic route:

Reference yield:

(S)-(+)-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-5-pivaloyloxymethoxycarbonyl-3-pyridinecarboxylic acid (138279-20-6) → (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester (178484-40-7)

Guidance literature:

With pyridinium hydrobromide perbromide; In dichloromethane; at -20 ℃;

DOI:10.1248/cpb.44.1132

Reference yield: 52.0%

2-methoxy-5,5-dimethyl-1,3,2-dioxaphosphorinane (1005-69-2) + (R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester (178484-40-7) → (R)-5-(5,5-Dimethyl-2-oxo-2λ5-[1,3,2]dioxaphosphinan-2-yl)-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester (170308-21-1)

Guidance literature:

With tetrakis(triphenylphosphine) palladium⁽⁰⁾; triethylamine; In toluene; at 110 ℃; for 5h;

DOI:10.1248/cpb.44.1132

Reference yield:

(R)-5-Bromo-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester (178484-40-7) → (-)-Efonidipine

Guidance literature:

Multi-step reaction with 3 steps

1: 52 percent / Pd(PPh₃)4, NEt₃ / toluene / 5 h / 110 °C

2: 43 percent / 2N aq. NaOH / methanol

3: WSC*HCl, TEA, DMAP / dimethylformamide

With dmap; sodium hydroxide; tetrakis(triphenylphosphine) palladium⁽⁰⁾; WSC*HCl; TEA; triethylamine; In methanol; N,N-dimethyl-formamide; toluene;

DOI:10.1248/cpb.44.1132

upstream raw materials:

(S)-(+)-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-5-pivaloyloxymethoxycarbonyl-3-pyridinecarboxylic acid

Downstream raw materials:

(R)-5-(5,5-Dimethyl-2-oxo-2λ⁵-[1,3,2]dioxaphosphinan-2-yl)-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid 2,2-dimethyl-propionyloxymethyl ester

(R)-5-(5,5-Dimethyl-2-oxo-2λ⁵-[1,3,2]dioxaphosphinan-2-yl)-2,6-dimethyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3-carboxylic acid