Abstract:
Delta 14-20-KETO-21-DIALKOXY STEROIDS ARE PREPARED BY OXIDIZING 20-KETO-15 Alpha ,21-DIHYDROXY STEROIDS OF THE GENERAL FORMULA
IN WHICH Y is an oxo group which may be ketalized, a
GROUP WHICH MAY BE ETHERIFIED OR ESTERIFIED, A Delta 3-, Delta 2-, OR Delta 3,5-ENOL ETHER GROUP OR A Delta 3-, Delta 2-, OR Delta 3,5-ENAMINO GROUP, WHICH GROUPS MAY HAVE A DOUBLE BOND IN THE 4-POSITION, AND
IS A LOWER ACYCLIC OR CYCLIC ACETAL GROUPING, ACETALIZING THE 15 Alpha -HYDROXY-20-KETO-21-OXO STEROIDS OBTAINED, REACTING THE 15 Alpha -HYDROXY-20-KETO-21-DIALKOXY STEROIDS THUS OBTAINED WITH SULFONIC ACID HALIDES AND TREATING THE 15-SULFONIC ACID ESTERS THUS OBTAINED WITH AGENTS SPLITTING OFF ACIDS. The products are valuable intermediates for the manufacture of medicaments.
Abstract:
The present invention relates to an improved process for the manufacture of Beta -(3-oxo-7 Alpha -thioacyl-17 Beta -hydroxy4-androstene-17 Alpha -yl)-propionic acid gamma -lactones in which a Beta -(3-oxo-17 Beta -hydroxy-4,6-androstadiene-17 gamma -yl)-propionaldehyde cyclohemiacetal alkyl glycoside is reacted with a thiocarboxylic acid in a mixture of water and an organic solvent miscible with water to yield a 3-(3''-oxo-7 Alpha ''thioacyl-17 Beta ''-hydroxy-4''-androstene-17 Alpha ''-yl)propionaldehyde cyclohemiacetal alkyl glycoside and in which the compound thus obtained is oxidized in an acid solution, the alkyl glycoside radical in the cyclohemiacetal group being split off, to yield the corresponding gamma -lactone; the invention further relates to new intermediates useful in this process and having the formula
IN WHICH R1 stands for the methyl group or a hydrogen atom and R2 and R3 each for an alkyl group having 1 to 5 carbon atoms.
Abstract:
Process for the manufacture of 4-chloro-3-oxo-14 Beta -hydroxyor 4-chloro-3,14 Beta -dihydroxy-carda-4,20(22)dienolides wherein 3-oxo-carda-4,14,20(22)-trienolides are at first treated with chlorine, the compounds obtained are converted by hydrogenolysis into 3-oxo-4-chloro-carda-4,14,20-trienolides, these are treated with N-bromo-acid amides, and the 3-oxo-4chloro-14 Beta -hydroxy-15 Alpha -bromo-carda-4,20(22)-dienolides thus obtained are treated with Raney nickel and may be reduced.
Abstract:
Cardioactive 3 Beta -hydroxy-14,15 Beta -epoxy-5 Beta cardenolide-or -5 Beta -bufadienolide-glucosides and rhamnosides. A method for making these compounds by reacting the corresponding 14-anhydrocardenolides or 14-anhydrobufadienolides with an acylhalopyranose, reacting the resultant acylated pyranoside with a hypohalous acid to form the corresponding halohydrin, and epoxidizing the halohydrin with a base.
Abstract:
wherein R is hydrogen or alkanoyl or alkyl having 1 to 5 carbon atoms are described as well as two processes for their preparation. The compounds show positive inotropic action and are suitable for treating heart diseases.
Digitoxigenin-3- Alpha -(L-rhamnopyranoside-2'',3''cyclocarbonates) of the general formula I
Abstract:
DELTA 14-20-KETO-21-DIALKOXY STEROIDS ARE PREPARED BY OXIDIZING 20-KETO-15 alpha ,21-DIHYDROXY STEROIDS OF THE GENERAL FORMULA IN WHICH Y is an oxo group which may be ketalized, GROUP WHICH MAY BE ETHERIFIED OR ESTERIFIED, A DELTA 3-, DELTA 2-, OR DELTA 3,5-ENOL ETHER GROUP OR A DELTA 3-, DELTA 2-, OR DELTA 3,5-ENAMINO GROUP, WHICH GROUPS MAY HAVE A DOUBLE BOND IN THE 4-POSITION, AND IS A LOWER ACYCLIC OR CYCLIC ACETAL GROUPING, ACETALIZING THE 15 alpha -HYDROXY-20-KETO-21-OXO STEROIDS OBTAINED, REACTING THE 15 alpha -HYDROXY-20-KETO-21-DIALKOXY STEROIDS THUS OBTAINED WITH SULFONIC ACID HALIDES AND TREATING THE 15-SULFONIC ACID ESTERS THUS OBTAINED WITH AGENTS SPLITTING OFF ACIDS. The products are valuable intermediates for the manufacture of medicaments.
Abstract:
A METHOD FOR SYNTHESIZING ESTERS IN WHICH THE ACID MOIETY IS THAT OF A HYDROXY ACID AND THE ALCOHOL MOIETY IS A 3-HYDROXY-CARDENOLIDE OR 3-HYDOXY-BUFADIENOLIDE, BY ESTERIFYING THE STEROL WITH AN ACID ANHYDRIDE OR AN ACID CHLORIDE OF THE HYDROXY ACID, THE HYDROXY GROUPS OF WHICH HAVE BEEN ACETALIZED OR KETALIZED, AND THEN SELECTIVELY REMOVING SAID ACETAL OR KETAL GROUPS BY ACID HYDROLYSIS. CARDI-ACTIVE OXY-ESTERS PRODUCED BY THIS METHOD.