72203-76-0

Upstream product

• 108-24-7 acetic anhydride 
• 86270-21-5 17β-nitroamino-5α-androstan-3β-yl acetate 
• 91934-55-3 3β-acetoxy-5α-androsta-16-ene-17-yl trifluoromethanesulfonate 
• 481-29-8 Epiandrosterone 
• 106-38-7 para-bromotoluene 
• 1239-31-2 3β-acetoxy-5α-androstan-17-one 

Downstream Products

• 72166-09-7 3β-acetoxy-4'ξ-[(tert-butyl-dimethyl-silanyloxy)-methyl]-2'-cyclohexyl-(5α,16β,17β)-tetrahydro-androstano[16,17-e][1,2]oxazine-3'ξ-carbonitrile 
• 72166-08-6 3β-acetoxy-2'-cyclohexyl-4'ξ-hydroxymethyl-(5α,16β,17β)-tetrahydro-androstano[16,17-e][1,2]oxazine-3'ξ-carbonitrile 
• 7148-51-8 5α-androst-16-en-3β-ol 
• 72166-32-6 3β-acetoxy-2'-cyclohexyl-4'ξ-methanesulfonyloxymethyl-(5α,16β,17β)-tetrahydro-androstano[16,17-e][1,2]oxazine-3'ξ-carbonitrile 
• 72166-17-7 3β-acetoxy-2'-cyclohexyl-4'ξ-hydroxymethyl-(5α,16β,17β)-tetrahydro-androstano[16,17-e][1,2]oxazine-3'ξ-carboxylic acid lactone 

Relevant academic research and scientific papers

Stille and Suzuki Cross-Coupling Reactions as Versatile Tools for Modifications at C-17 of Steroidal Skeletons – A Comprehensive Study

Herein, we report on a comparative Stille and Suzuki cross-coupling study of steroidal vinyl (pseudo)halides with different boronic acids and tributyltin organyls. Furthermore, we have investigated the “inverse” case of those cross-coupling reactions, i.e., the reaction of a steroidal vinylpinacolatoborane or a tributyltin steroid with various bromides. The development of both methods allows the introduction of different residues at C-17 of steroid skeletons providing access to a broad variety of steroid analogues which are of high interest for biological screenings or natural product synthesis. (Figure presented.).

Pd-mediated cross-coupling of C-17 lithiated androst-16-en-3-ol-access to functionalized arylated steroid derivatives

Herein, we report on Pd-mediated cross-coupling of vinyllithium steroids and aryl bromides to introduce various substituted aryls at C-17 of steroidal frameworks based on the structure of epi-androsterone. Compared to other C-C cross-couplings, this method turned out to be an easy and competitive access to biologically interesting C-17 modified steroids.

Steroidal N-Nitro-amines. Part 2. Denitroamination of Steroidal 12β-, 17β-, 20β-, and 23R-Nitro-amines

20β-Nitroaminopregn-5-en-3β-yl acetate (13a), 17β-nitroamino-5α-androstan-3β-yl acetate (14), and 12β-nitroamino-(25R)-5α-spirostan-3β-yl acetate (15a) have been prepared by nitrosation of the corresponding oximes, followed by reduction with sodium borohydride.The 23-nitro-imine (12), obtained by reaction of sarsasapogenin acetate (10) with nitrous acid and boron trifluoride-diethyl ether complex, was similarly reduced to give 23R-nitroamino-(20S,22S,25S)-5β-spirostan-3β-yl acetate (16).Denitroamination of (13a) was achieved by treatment with acetic anhydride and pyridine to give the acetates of pregna-5,20-dien-3β-ol (17), pregn-5-ene-3β,20β-diol (18), 17α-methyl-D-homo-androst-5-ene-3,17aβ-diol (19), and 17α-methyl-12a-methylene-C(12a)-homo-18-norandrost-5-en-3β-ol (20).Under the same conditions the nitro-amine (14) afforded the acetates of 5α-androst-16-en-3β-ol (27a), 17β-methyl-18-nor-5α-androst-12-en-3β-ol (28a), 17-methyl-18-nor-5α-androst-13(17)-en-3β-ol (29a), and 17β-methyl-18-nor-5α-androst-13-en-3β-ol (30a).Denitroamination of (15a) took place through the expected C-nor-D-homo rearrangement producing 14(13->12αH)abeo-(25R)-5α-spirost-13(18)-en-3β-yl acetate (31) in high yield and a minor amount of 14(13->12)abeo-(25R)-5α-spist-12-en-3β-yl acetate (32).The trans-stereochemistry of the β-hydrogen-elimination produced in the denitroamination of (16) was established by using labelled sarsasapogenin (10) biosynthesized by Agave attenuata from mevalonic acid.