140147-41-7

Upstream product

• 82521-53-7 cis-4a-cisoid-4a,4b-trans-4b-perhydro-2α,4bβ,8,8-tetramethyl-2β-vinylphenanthrene-10α-ol 
• 124456-60-6 cis-4a-cisoid-4a,4b-trans-4b-3-(tert-butydimethylsilyloxy)-1,4,4a,4b,5,6,7,8,8a,10a-decahydro-2,4bβ,8,8-tetramethylphenanthrene-10(9H)-on 
• 124456-65-1 (4aS,4bS,8aR,9S,10aR)-6-(tert-Butyl-dimethyl-silanyloxy)-1,1,4a,7-tetramethyl-1,2,3,4,4a,4b,5,8,8a,9,10,10a-dodecahydro-phenanthren-9-ol 
• 124456-63-9 cis-4a-cisoid-4a,4b-trans-4b-10α-acetoxy-perhydro-2α,4bβ,8,8-tetramethyl-2β-vinylphenanthrene-3-one 
• 124456-64-0 (4aR,4bR,10aR)-6-(tert-Butyl-dimethyl-silanyloxy)-1,1,4a,7-tetramethyl-9-oxo-1,3,4,4a,4b,5,8,9,10,10a-decahydro-2H-phenanthrene-8a-carbaldehyde 
• 124456-61-7 cis-4a-cisoid-4a,4b-trans-4b-10α-acetoxy-3-(tert-butydimethylsilyloxy)-1,4,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-2,4bβ,8,8-tetramethylphenanthrene 
• 124456-62-8 Acetic acid (4aS,4bS,7R,8aR,9S,10aR)-1,1,4a,7-tetramethyl-6-oxo-7-(1-phenylsulfanyl-ethyl)-tetradecahydro-phenanthren-9-yl ester 
• 56666-27-4 3,4,4aα,5,6,7,8,8aβ-octahydro-5,5,8aβ-trimethyl-3-oxonaphthalene-2-carboxaldehyde 

Relevant academic research and scientific papers

THE STEREOSELECTIVE SYNTHESIS OF (+/-)-9βH-PIMARA-7,19-DIENE

The trans-syn-cis tricyclic system, present in (+/-)-9βH-pimara-7,19-diene (8) was formed via a Diels-Alder reaction of enone aldehyde 2 with 2-(tert-butyldimethylsilyloxy)-3-methyl-1,3-butadiene.The resulting regiospecific silyl enol ether was deformylat