(4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester

Base Information

• Chemical Name: (4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester
• CAS No.: 464173-87-3
• Molecular Formula: C₂₁H₂₉NO₅
• Molecular Weight: 375.465
• Mol file: 464173-87-3.mol

Synonyms:(4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester

Chemical Property of (4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester

Chemical Property:

Purity/Quality:

Safty Information:

• Pictogram(s):  
• Hazard Codes: 

MSDS Files:

Useful:

Technology Process of (4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester

There total 4 articles about (4R,5S)-N^α-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl 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: 63.0%

(4R,5S)-Nα-tert-butoxycarbonyl-5-allyl-4-benzyl-L-proline ethyl ester (464173-86-2) → (4R,5S)-Nα-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester (464173-87-3)

Guidance literature:

(4R,5S)-N^α-tert-butoxycarbonyl-5-allyl-4-benzyl-L-proline ethyl ester; With ozone; In dichloromethane; at -78 ℃;

With dimethylsulfide; In dichloromethane; at 20 ℃; for 120h; Further stages.;

DOI:10.1021/jo0203591

Reference yield:

ethyl (2S,4R)-1-(tert-butoxycarbonyl)-4-benzylpyroglutamate (153080-85-4) → (4R,5S)-Nα-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester (464173-87-3)

Guidance literature:

Multi-step reaction with 4 steps

1.1: lithium triethylborohydride / tetrahydrofuran / 0.58 h / -78 °C

1.2: H₂O₂ / tetrahydrofuran; H₂O / 0.5 h / 0 °C

2.1: 4900 mg / (p-CH₃C₆H₄)SO₃H*H₂O / 20 °C

3.1: 76 percent / BF₃*Et₂O / diethyl ether / 3 h / -78 °C

4.1: O₃ / CH₂Cl₂ / -78 °C

4.2: 63 percent / (CH₃)2S / CH₂Cl₂ / 120 h / 20 °C

With boron trifluoride diethyl etherate; lithium triethylborohydride; toluene-4-sulfonic acid; ozone; In tetrahydrofuran; diethyl ether; dichloromethane;

DOI:10.1021/jo0203591

Reference yield:

(4R)-Nα-tert-butoxycarbonyl-4-benzyl-5-methoxy-L-proline ethyl ester (464173-85-1) → (4R,5S)-Nα-tert-butoxycarbonyl-4-benzyl-5-(2-oxoethyl)-L-proline ethyl ester (464173-87-3)

Guidance literature:

Multi-step reaction with 2 steps

1.1: 76 percent / BF₃*Et₂O / diethyl ether / 3 h / -78 °C

2.1: O₃ / CH₂Cl₂ / -78 °C

2.2: 63 percent / (CH₃)2S / CH₂Cl₂ / 120 h / 20 °C

With boron trifluoride diethyl etherate; ozone; In diethyl ether; dichloromethane;

DOI:10.1021/jo0203591

upstream raw materials:

(4R,5S)-N^α-tert-butoxycarbonyl-5-allyl-4-benzyl-L-proline ethyl ester

ethyl (2S,4R)-1-(tert-butoxycarbonyl)-4-benzylpyroglutamate

(2S,4R)-4-Benzyl-5-hydroxy-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester

(4R)-N^α-tert-butoxycarbonyl-4-benzyl-5-methoxy-L-proline ethyl ester

Downstream raw materials:

(4R,5S)-N^α-tert-butoxycarbonyl-5-[(3R)-3-(benzyloxycarbonyl)amino-3-(methoxycarbonyl)propyl]-4-benzyl-L-proline ethyl ester

(4R,5S)-N^α-tert-butoxycarbonyl-5-[(3S)-3-(benzyloxycarbonyl)amino-3-(methoxycarbonyl)propyl]-4-benzyl-L-proline ethyl ester

(4R,5S)-N^α-tert-butoxycarbonyl-5-[3-(benzyloxycarbonyl)amino-3-(methoxycarbonyl)allyl]-4-benzyl-L-proline ethyl ester