(3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester

Base Information

• Chemical Name: (3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester
• CAS No.: 104120-87-8
• Molecular Formula: C₂₃H₂₈O₄
• Molecular Weight: 368.473
• Mol file: 104120-87-8.mol

Synonyms:(3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester

Chemical Property of (3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester

Chemical Property:

Purity/Quality:

Safty Information:

• Pictogram(s):  
• Hazard Codes: 

MSDS Files:

Useful:

Technology Process of (3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester

There total 1 articles about (3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid 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: 60.0%

(3aS,4R,6aS)-4-Benzyloxy-1-oxo-1,3a,4,5,6,6a-hexahydro-pentalene-2-carboxylic acid ethyl ester (104106-71-0) + isoprene (78-79-5,9003-31-0) → (3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester (104120-87-8)

Guidance literature:

With tin(IV) chloride; at -78 ℃;

DOI:10.1016/S0040-4039(00)94967-0

Reference yield: 100.0%

(3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester (104120-87-8) → (3R,3aS,3bS,7aS,8R,8aS)-3-Benzyloxy-7a-hydroxymethyl-5-methyl-1,2,3,3a,3b,4,7,7a,8,8a-decahydro-cyclopenta[a]inden-8-ol (104106-72-1,104154-17-8)

Guidance literature:

With sodium bis(2-methoxyethoxy)aluminium dihydride; In tetrahydrofuran; Ambient temperature;

DOI:10.1016/S0040-4039(00)94967-0

Reference yield:

(3S,3aR,3bR,7aS,8aR)-3-Benzyloxy-5-methyl-8-oxo-2,3,3a,3b,4,7,8,8a-octahydro-1H-cyclopenta[a]indene-7a-carboxylic acid ethyl ester (104120-87-8) → (3R,3aR,3bS,7aS,8aR)-3-Benzyloxy-5,7a-dimethyl-1,2,3,3a,3b,4,7,7a,8,8a-decahydro-cyclopenta[a]indene (104106-74-3)

Guidance literature:

Multi-step reaction with 4 steps

1: 100 percent / sodium bis(2-methoxyethoxy)aluminium hydride / tetrahydrofuran / Ambient temperature

2: 4-(N,N-dimethylamino)pyridine / acetonitrile / Ambient temperature

3: tri-n-butyltin hydride, azobisisobutyronitrile / toluene / Heating

4: 1.) MsCl, Et₃N 2.) zinc dust, lithium iodide / 2.) heating, dimethylformamide, 145degC

With dmap; 2,2'-azobis(isobutyronitrile); tri-n-butyl-tin hydride; methanesulfonyl chloride; triethylamine; sodium bis(2-methoxyethoxy)aluminium dihydride; lithium iodide; zinc; In tetrahydrofuran; toluene; acetonitrile;

DOI:10.1016/S0040-4039(00)94967-0

upstream raw materials:

(3aS,4R,6aS)-4-Benzyloxy-1-oxo-1,3a,4,5,6,6a-hexahydro-pentalene-2-carboxylic acid ethyl ester

isoprene

Downstream raw materials:

(3R,3aS,3bS,7aS,8R,8aS)-3-Benzyloxy-7a-hydroxymethyl-5-methyl-1,2,3,3a,3b,4,7,7a,8,8a-decahydro-cyclopenta[a]inden-8-ol

C₂₁H₂₈O

(3R,3aR,3bS,7aS,8aR)-3-Benzyloxy-5,7a-dimethyl-1,2,3,3a,3b,4,7,7a,8,8a-decahydro-cyclopenta[a]indene

(3aS,3bR,4R,6aR,7aR)-4-Benzyloxy-7a-methyl-decahydro-cyclopenta[a]pentalen-3-one