Abstract:
The present invention relates to an improved process for the preparation of abiraterone acetate. More specifically the invention relates to a process for the preparation of abiraterone acetate free from dimer and other impurities.
Abstract:
The present invention relates to process for the preparation of abiraterone acetate, its salts and intermediates thereof, crystalline forms of abiraterone acetate salts and purification of abiraterone acetate.
Abstract:
The present invention relates to processesfor obtaining abirateroneand derivatives thereof, such as abiraterone acetate, by means of a Suzuki coupling through a steroid borate of general formula (IV) or a C-C coupling through a steroid hydrazone of general formula (II), as well as to intermediates useful in said processes.
Abstract:
The present invention relates to processesfor obtaining abirateroneand derivatives thereof, such as abiraterone acetate, by means of a Suzuki coupling through a steroid borate of general formula (IV) or a C-C coupling through a steroid hydrazone of general formula (II), as well as to intermediates useful in said processes.
Abstract:
A process is disclosed for preparing 16 alpha -hydroxy-estra-1,3,5(10)-triene derivatives having the general formula (I), in which R1 stands for a hydrogen atom, an alkyl group with maximum 4 carbon atoms, a benzyl group or an acyl group with maximum 8 carbon atoms; and X and Y represent together an oxo group or X stands for a hydroxyl group and Y for a hydrogen atom. This process is characterised in that an estra-1,3,5(10),16-tetraene derivative is converted by means of peracids into a 16 alpha ,17 alpha -epoxide, which is split by means of mineral acids or converted by means of a reagent which supplies bromine cations into the corresponding 16 alpha -bromine derivative, which is converted into the 16 beta -bromine derivative. The bromine is replaced by an hydroxyl group and if required the thus obtained 16 alpha -hydroxy-1,3,5(10)triene-17-one derivative is reduced by means of sodium hydroboron in the presence of a strong aqueous buffer solution with a pH value from 5 to 6.5 into the corresponding 16 alpha ,17 beta -trihydroxy-estra-1,3,5(10)-triene derivative.
Abstract:
The invention relates to estrene steroid, which bind to neuroepithelial receptors. The steroid is preferably administered in the form of a pharmaceutical composition containing one or more pharmaceutically acceptable carriers. The figure illustrates the synthesis of 1,3,5(10),16-estratetraen-3-ol.
Abstract:
Compounds of general formula (1) wherein X represents the residue of the A, B and C rings of a steroid, R represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, R14 represents a hydrogen atom and R15 represents a hydrogen atom or an alkyl or alkoxy group of 1-4 carbon atoms, or a hydroxy or alkylcarbonyloxy group of 2 to 5 carbon atoms or R?14 and R15¿ together represent a double bond, and R16 represents a hydrogen atom or an alkyl group of 1 to 4 carbon atoms, in the form of the free bases or pharmaceutically acceptable acid addition salts, with the proviso that 17-(3-pyridyl)androsta-5,14,16-trien-3β-ol and 15β-acetoxy-17-(3-pyridyl)androsta-5,16-dien-3β-ol and their 3-acetates and 3β-methoxy-17-(3-pyridyl)androst-16-ene are claimed only for use in therapy are useful for treatment of androgen-dependent disorders, especially prostatic cancer, and also oestrogen-dependent disorders such as breast cancer.
Abstract:
An 11 beta -aryl-19-norprogesterone steroid of formula (I): wherein (i) R is H, C1-4 alkyl, C2-4 alkenyl, C2-4 alkynyl, OH, OC(O)CH3, or OC(O)R , wherein R is C2-8 alkyl, C2-8 alkenyl, C2-8 alkynyl or aryl, R2 is H, R is H, C1-4 alkyl, C2-4 alkenyl or C2-4 alkynyl, R is H, CH3, F or Cl, R is H, (CH3)2N, CH3O, CH3CO, CH3S, CH3SO, CH3SO2, and X is O or NOCH3; or (ii) R and R taken together are a carbon-carbon bond and R , R , R and X are as defined above; or (iii) R and R taken together are -CH2- or -N=N-CH2-, R is H and R , R and X are as defined above; or (iv) R and R taken together are =CH2 and R , R , R and X are as defined above.
Abstract:
Genetically engineered host cells containing new expression cassettes are provided which are able to carry out biochemical oxidations of steroids. In particular the oxidation is carried out with cells into which DNA has been introduced which encodes protein involved in the biological pathway of cholesterol to hydrocortisone. Suited host cells comprise species of Bacillus, Saccharomyces or Kluyveromyces. The new host cells are suited for microbiological oxidations of cholesterol, pregnenolone, progesterone, 17alpha-hydroxy-progesterone, and cortexolone, which are intermediates in said biological pathway. The new expression cassettes are also useful in the ultimate production of a multigenic system for a one-step conversion of cholesterol into hydrocortisone.
Abstract:
A process for the synthesis of 3β-hydroxy-17-(1H-benzimidazol-1-yl)androsta-5,16-diene is described, a compound also known as Galeterone and used in the treatment of prostate cancer, having the formula (I) given below.