1045-71-2Relevant articles and documents
Synthesis and evaluation of novel steroidal oxime inhibitors of P450 17 (17α-hydroxylase/c17-20-lyase) and 5α-reductase types 1 and 2
Hartmann,Hector,Haidar,Ehmer,Reichert,Jose
, p. 4266 - 4277 (2000)
17α-Hydroxylase/C17-20-lyase (P450 17, CYP 17) and 5α-reductase are the key enzymes in androgen biosynthesis and targets for the treatment of prostate cancer and benign prostatic hyperplasia. In the search of inhibitors for both enzymes, 23 pregnenolone- or progesterone-based steroids were synthesized bearing an oxime group connected directly or via a spacer to the steroidal D-ring. Tested for inhibition of human and rat P450 17, some pregnenolone (9, 11, 14) and a series of progesterone compounds (17-20) turned out to be highly active inhibitors of the human enzyme. The most active compound was Z-21-hydroxyiminopregna-5,17(20)-dien-3β-ol (9) showing K(i) values of 44 and 3.4 nM for the human and rat enzymes, respectively, and a type II UV-difference spectrum indicating a coordinate bond between the oxime group and the heme iron. In contrast to the pregnenolones which showed no inhibition of 5α-reductase isozymes 1 and 2, the progesterones 16, 17, 20, 21, and 23 showed marked inhibition, especially toward the type 2 enzyme. Compounds 17 and 20 were identified as potent dual inhibitors of both P450 17 and 5α-reductase. Tested for selectivity, the most potent P450 17 inhibitors 9, 10, and 14 showed no or only marginal inhibition of P450 arom, P450 scc, and P450 TxA2. Selected compounds were tested for inhibition of the target enzymes using whole-cell assays. Compounds 9-11 strongly inhibited P450 17 being coexpressed with NADPH-P450 reductase in E. coli cells, and 16, 20, and 23 markedly inhibited 5α-reductase expressed in HEK 293 cells. Tested for in vivo activity, 9 (0.019 mmol/kg) decreased the plasma testosterone concentration in rats after 2 and 6 h by 57% and 44%.
Proficient synthesis of biologically active pregnane derivatives and its glycoside - Experimental and theoretical approach
Sethi, Arun,Bhatia, Akriti,Maurya, Atul,Panday, Anil,Bhatia, Gitika,Shrivastava, Atul,Singh, Ranvijay Pratap,Prakash, Rohit
, p. 112 - 124 (2013)
Synthesis of a number of pregnane derivatives including the glycoside has been described in detail. These compounds were synthesized by reaction of 3β-acetoxy-5, 16-pregnadiene-20-one, derived from diosgenin and then treating it with different nucleophilic reagents. The structures of these newly synthesized compounds were established on the basis of their physical, chemical and spectral data. The molecular geometry of compounds were calculated in ground state by density functional theory method (DFT/B3LYP) using 6-31G (d,p) basis set. 1H NMR chemical shifts were also studied using gauge-including atomic orbital (GIAO) approach, which were found in good agreement with the experimental values. The study of electronic properties such as UV-Vis spectral analysis, HOMO and LUMO energy calculations were performed with time dependent DFT (TD-DFT). Global and local reactivity descriptors were calculated to study the reactive sites within the molecules. These compounds were also evaluated for their anti-dyslipidemic (Triton model) and in vitro anti-oxidant activities. Out of these, compound 9 showed potent anti-dyslipidemic and anti-oxidant activity.
Reactivity of steroidal 1-azadienes toward enamines: an approach to novel chiral penta- And hexacyclic steroids
Lopes, Susana M. M.,Santos, Joana R. C.,Pinho e Melo, Teresa M. V. D.
, p. 1122 - 1132 (2021/02/16)
The chemical behavior of steroidalN-sulfonyl-1-azadienes toward carbonyl compounds, in the presence of pyrrolidine, is described. With aldehydes, these azadienes participate in hetero-Diels-Alder reactions with thein situgenerated enamines. The stereoselectivity results from the approach of the dienophiles from the less hindered α-face of the steroid, with the pyrrolidine moietyendoand retention of the enaminetransgeometry. This diastereoselective synthetic methodology led to a new class of chiral pentacyclic steroids. Interestingly, the studied steroidal scaffolds follow a different mechanistic pathway with cyclic ketones. They undergo a diastereoselective annulation reaction, under enamine catalysis, affording chiral hexacyclic steroids.
PREGNANE-OXIMINO-AMINOALKYLETHERS AND PROCESS FOR PREPARATION THEREOF, USEFUL AS ANTIDIABETIC AND ANTIDYSLIPIDEMIC AGENTS
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, (2014/08/07)
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.
Expeditious and convenient synthesis of pregnanes and its glycosides as potential anti-dyslipidemic and anti-oxidant agents
Sethi, Arun,Maurya, Atul,Tewari, Vibha,Srivastava, Sanjay,Faridi, Shaheen,Bhatia, Gitika,Khan,Khanna,Saxena
, p. 4520 - 4527 (2008/03/13)
A series of new pregnane derivatives and its glycosides were synthesized in order to find new 'leads' against some important targets. The 3β-hydroxy-16α-(2-hydroxy ethoxy) pregn-5-en-20-one (5) was synthesized from 3β-hydroxy-5,16-pregnadiene-20-one (2) by adopting general modified procedure using BF3:Et2O as a catalyst. Reduction of 5, with sodium borohydride yielded 3β,20β-dihydroxy-16α-(2-hydroxy ethoxy) pregn-5-en (7) as the major isolable product. O-alkylation of the C-20-oxime-pregnadiene (9) with 1,5-dibromopentane yielded 20-(O-5-bromopentyl)-oximino-3β-hydroxy-pregn-5,16-diene (11). Synthesis of C-16 substituted pregnane glycosides (20) and (21) were accomplished with the imidate method using BF3:Et2O. The synthesis of 4-chlorobenzoate (3) and 2-chlorobenzoate (4), derivatives of 2 were also accomplished. These compounds were evaluated for their anti-dyslipidemic and anti-oxidant activity and amongst them compounds 3 and 7 showed more lipid lowering and anti-oxidant activity.
