17916-30-2

Upstream product

• 77-60-1 tigogenin 
• 145-13-1 Pregnenolone 
• 168609-36-7 3β-acetoxy-14β.17βH-pregnen-(5)-one-(20) 
• 979-02-2 16-dehydropregnenolone acetate 
• 1778-02-5 Pregnenolone acetate 

Downstream Products

• 1778-02-5 Pregnenolone acetate 
• 111968-94-6 20-(phenylthioimino)pregn-5-en-3β-yl acetate 
• 1865-62-9 17β-acetylamino-androst-4-en-3-one 
• 1239-31-2 3β-acetoxy-5α-androstan-17-one 

Relevant academic research and scientific papers

Chlorotropylium Promoted Conversions of Oximes to Amides and Nitriles

Chlorotropylium chloride as a catalyst for the transformations of oximes, ketones, and aldehydes to their corresponding amides and nitriles in excellent yields (up to 99 %) and in short reaction times (mostly 10–15 min). Oximes were electrophilically attacked on the hydroxyl oxygen by chlorotropylium. The produced tropylium oxime ethers were the key intermediates, of which the ketoxime ether led to amide through Beckmann rearrangement, and the aldoxime ether led to nitrile by nitrogen base DBU assisted formal dehydration. This chlorotropylium activation protocol offered general, mild, and efficient avenues bifurcately from oximes to both amides and nitriles by one organocatalyst.

Dichloroimidazolidinedione-Activated Beckmann Rearrangement of Ketoximes for Accessing Amides and Lactams

A novel protocol for the activation of the Beckmann rearrangement utilizing the readily available and economical geminal dichloroimidazolidinediones (DCIDs) on a substoichiometric scale (10 mol %) has been developed. A unique self-propagating mechanism for the substoichiometric dichloroimidazolidinedione-activated transformation was proposed and validated. The substrate scope of the developed protocol has been demonstrated by 23 examples with good to excellent yields (mostly 90-98%) in a short time (mostly 10-30 min), including a substrate for synthesizing the monomer of nylon-12 and a complicated steroidal substrate on a preparative scale. This research not only unveils for the first time the synthetic potential of substoichiometric amounts of dichloroimidazolidinediones in promoting chemical transformation but also offers yet another important illustration of the self-propagating cycle in the context of the Beckmann rearrangement activated by a structurally novel organic promoter.

Mild, calcium catalysed Beckmann rearrangements

A mild calcium catalysed Beckmann rearrangement has been realised, which forgoes the more traditional harsh reactions conditions associated with the transformation. The catalyst system is shown to be tolerant towards a wide variety of functional groups relevant to natural product synthesis and medicinal chemistry and the synthetic utility of the reaction has also been investigated. A preliminary mechanistic investigation was performed to understand the nature of the incoming nucleophile and a possible reaction pathway is described.

PREGNANE-OXIMINO-AMINOALKYLETHERS AND PROCESS FOR PREPARATION THEREOF, USEFUL AS ANTIDIABETIC AND ANTIDYSLIPIDEMIC AGENTS

The present invention relates to the synthesis of pregnane-oximino-aminoalkyl-ethers and their antidiabetic and antidyslipidemic activities. More particularly, the invention relates to the synthesis of compounds of formula 3 and biological profile thereof. Further the invention relates to compounds of formula 3 and pharmaceutically acceptable salts thereof.

Synthesis and evaluation of some 17-acetamidoandrostane and N,N-dimethyl-7-deoxycholic amide derivatives as cytotoxic agents: Structure/activity studies

Using pregnenolone and 7-deoxycholic acid as starting materials, some 17-acetamidoandrostane and N,N-dimethyl-7-deoxycholic amide derivatives were synthesized. The cytotoxicity of the synthesized compounds was tested in vitro against two tumor cell lines: SGC 7901 (human gastric carcinoma) and Bel 7404 (human liver carcinoma). The result showed that the blockage of the interaction of the amide group with outside groups might cause a decrease of the cytotoxicity, and an O-benzyloximino group at the 3-position of N,N-dimethyl-7-deoxycholic amide could enhance the cytotoxic activity of the compound. The information obtained from the studies provides the structure-activity relationship for these compounds and may be useful for the design of novel chemotherapeutic drugs.

Synthesis of pregnane derivatives, their cytotoxicity on LNCaP and PC-3 cells, and screening on 5α-reductase inhibitory activity

A series of epoxy-and/or 20-oxime pregnanes were synthesized from commercially available pregnenolone. Compounds 1, 3, 7, 8 and 11-13 were evaluated for cytotoxicity activity towards LNCaP (androgen-dependent) and PC-3 (androgenindependent) prostate cancer cells. Compound 13 showed the highest activity on both LNCaP (IC50 15.17 μM) and PC-3 (IC50 11.83 μM) cell lines. Compound 11 showed weak activity on LNCaP cells (IC50 71.85 μM) and 8 showed the weak activity on PC-3 cells (IC50 68.95 μM), respectively. The 5α-reductase II (5AR2) inhibitory effects of compounds 1-3, 5 and 7-13 were investigated in a convenient screening model, in which compounds 5, 8, 11 and 12 were observed to be potential inhibitors of 5α-reductase, in particular, the 4-azasteroid 11, that also inhibited cell proliferation of androgen-dependent cells and 8, that in addition inhibited PC-3 cells more potently than LNCaP cells.

Convenient synthesis of new pregnenolone oximinyl oxalate dimers

Three new symmetrical pregnenolone oxyminyl oxalate dimers (8-10) were synthesized from the corresponding pregnenolone oximes (3, 5, and 7) at room temperature. All dimers were characterised by spectroscopic means, notably HRFABMS and comprehensive NMR spectroscopic data analyses.

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.

CHEMICAL COMPOSITIONS

The invention disclosed herein relates to novel steroid compositions and, more particularly, to compositions effective as androgen biosynthesis inhibitors and containing 3-oxygenated-17-acylamido-steroids of the androstane series. The new compositions, comprising 3-oxygenated-17-acylamidoandrostanes and unsaturated derivatives, are extremely active in lowering the biosynthesis of testicular androgens which can stimulate over development of sebaceous glands with resultant acne and which are often productive of prostatic enlargement.