摘要:
Described herein is a process for the preparation of an acetal of formula (I) in which R1 is an alkyl, R2 is H or an acyl, X is &bgr;-OH and Y is H, comprising the acetalization with control of the epimeric distribution at the C-22 position, for treatment with R1 CHO in aqueous HBr or HI of a compound of formula (II) in which R2 has the meaning specified above, R3 and R4 are both H, or, taken together, are —C(R5)(R6)—, where R5 and R6, which may be the same or different from one another, are alkyl groups, and X and Y are chosen from among the following: A) X and Y, taken together, are an additional bond between C-9 and C-11; B) X is &bgr;-OH, and Y is H or an &agr;-halogen; C) X is &bgr;-OR7 where R7 is an acyl, and Y is H or an &agr;-halogen; and D) X and Y, taken together, are —O—.
摘要:
The invention concerns compounds of formula I ##STR1## in which R.sub.1 is hydrogen or a straight or branched hydrocarbon chain; R.sub.2 is hydrogen or a straight or branched hydrocarbon chain; R.sub.3 is acyl; X.sub.1 is hydrogen, fluorine or chlorine; and X.sub.2 is hydrogen, fluorine or chlorine. Also disclosed are processes for preparation of the compounds, pharmaceutical compositions containing them and methods employing the compounds in the treatment of inflammatory and allergic conditions.
摘要:
Compounds of formula I ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, n, and are as defined herein, their use as antiinflammatory, immunosuppressive, and antiallergic agents, pharmaceutical compositions comprising them, and methods for their preparation comprising irradiating compounds of formula II ##STR2## under an inert atmosphere, in the presence or absence of a compound of formula R.sub.3 --S--S(O).sub.m --R.sub.8, where R.sub.7, R.sub.8, and m are as defined herein, and methods for their preparation comprising oxidizing, reducing, halogenating, or alkylating compounds of formula I are disclosed.
摘要:
A process is described for the preparation of a compound of formula (I) or a stereoisomeric compound thereof, in which the 1,2-position is saturated or is a double bond; X.sup.1 and X.sup.2 are each independently hydrogen or halogen; R.sup.1 is hydrogen or acyl; R.sup.2 is hydroxyl, acyloxy or oxo; and R.sup.3 is alkyl, by reacting a compound of formula (II) with an aldehyde R.sup.3 CHO in either phosphoric acid or about 60% to about 75% w/w sulphuric acid. Compounds of formula (I) are either pharmacologically active steroids or are intermediates in the synthesis of pharmacologically active steroids. ##STR1##
摘要:
The invention describes a process for the epimer enrichment of compounds of formula (I) by silation, fractionated crystallization and acid hydrolysis. ##STR1##
摘要:
A pharmaceutical composition comprising a compound represented by the following formula (I): X--Y--Z (I) �where Y is represented by the following formula (III): ##STR1## X is a monovalent group of a tetracycline type compound, and Z is a monovalent group of asteroid type compound such as estrogen!. The compound can concentrate on the bone tissue and has a bone resorption inhibition/ossification promotion functions.
摘要:
The present invention relates to compounds of the formula: ##STR1## in which X.sub.1 and X.sub.2 correspond to H or F without distinction; R.sub.1 represents the following radicals: ##STR2## and R.sub.2 represents the radicals ##STR3## in the form of an R epimer, an S epimer, or a stereoisomeric mixture of the R and S epimers in terms of the orientation of the substituents on the carbon atom at position 22, novel intermediates and a method of their preparation by hydrolysis-ketalization, and use of such compounds as drugs and/or therapeutic agents.
摘要:
Compounds of the formula: ##STR1## wherein X is H, F, Cl, or CH.sub.3and Y is ##STR2## wherein R.sub.1 is H, alkyl of 1-5 carbon atoms, phenyl, or benzyl;R.sub.2 is COOR.sub.6, R.sub.5 COOR.sub.6, or R.sub.5 CONHR.sub.6 ;R.sub.3 is H, F, OH, or CH.sub.3 ;R.sub.4 is CH.sub.2 OH, CH.sub.2 OCOR.sub.6, COOR.sub.6, or CONHR.sub.6 ;R.sub.5 is alkyl of 1-3 carbon atoms;R.sub.6 is alkyl of 1-5 carbon atoms, or benzyl; represents a single or double bond;.about. represents .alpha.-position, .beta.-position, or a mixture of both .alpha.- and .beta.-positions; and-- represents .alpha.-position;and methods for preparing the same.
摘要:
The invention provides compounds of the formulaD--DHC].sub.n (I)and the nontoxic pharmaceutically acceptable salt thereof, wherein D is the residue of a centrally acting drug containing at least one reactive functional group selected from the group consisting of amino, hydroxyl, mercapto, carboxyl, amide and imide, said residue being characterized by the absence of a hydrogen atom from at least one of said reactive functional groups in said drug; n is a positive integer equal to the number of said functional groups from which a hydrogen atom is absent; and [DHC] is the reduced, biooxidizable, bloodbrain barrier penetrating lipoidal form of a dihydropyridine.revreaction.pyridinium salt redox carrier, said carrier comprising a bivalent radical of the formula ##STR1## wherein the alkylene group can be straight or branched and can contain 1 to 3 carbon atoms; R.sub.o is a radical identical to the corresponding portion of a natural amino acid; and p is 1 or 2, provided that, when p is 2, then the alkylene groups can be the same or different and the R.sub.0 radicals can be the same or different; said bivalent radical being so positioned that the terminal carbonyl function of the bivalent radical is linked to the drug residue while the terminal amino function of the bivalent radical is linked to the remaining portion of the carrier moiety. The subject compounds are adapted for the site-specific/sustained delivery of centrally acting drugs to the brain. The corresponding pyridinium salt type drug/carrier entities D--QC.sup.+ ].sub.n qY.sup.-t are also disclosed.
摘要:
A method of controlling the epimeric distribution in the preparation of 16,17-acetals of pregnane derivatives characterized in reaction of a corresponding 16,17-acetonide with an aldehyde or ketone in (a) hydrocarbon solvent wherein the solubility of the pregnane derivative is less than 1 mg/l or in a halogenated hydrocarbon solvent together with a hydrohalogen acid or an organic sulphonic acid as catalyst and in the presence of small grains of an insert material in the reaction medium or (b) a halogenated hydrocarbon solvent together with a hydrohalogen acid an organic sulphonic acid as catalyst and in the presence of an epimeric distribution modifier.