Abstract:
The present invention relates to naphthoquinone derivatives isolated from solid callus cultures from two species of the palaeotropical plant families Dioncophyllaceae and Ancistrocladaceae. It further relates to methods of their production as well as to their use as antiinfective and antitumoral pharmaceuticals.
Abstract:
The present invention provides a compound selected from the group consisting of (I), (II), and (III), wherein R and R are the same or different and are each H, C1-C3 alkyl, phosphate, or C1-C3 alkyl carboxylate; R and R are the same or different and are each H, a halogen, A-Z, S-Z, S-A-Z, N(B)-Z, N(B)-A-Z, O-Z, or O-A-Z, wherein: A is a C1-C20 linear or branched saturated or unsaturated alkyl, haloalkyl, arylalkyl, cycloalkylalkyl, heterocycloalkyl, hydroxyalkyl, alkoxyalkyl, thioalkyl, carboxyalkyl, carboalkoxyalkyl, carboxyaminoalkyl, a 5- to 6-membered ring carbohydrate or the corresponding acyclic analog thereof, peptidyl, or aminoalkyl diradical; B is H or C1-C6 alkyl; Z is H, aryl, heterocyclic, or a heteroatom-containing functional group; and R -R are the same or different and are each H, a halogen, heterocyclic, Z as defined above, A-Z as defined above, or heteroatom-containing functional group, provided that R -R are not all H, useful as cellular growth inhibitors.
Abstract:
The present invention relates to a method for the preparation of a compound having formula (I) wherein: • R1, R2, R3, and R4 are in particular H or halogen, • R5 is in particular (C1-C6)alkyl, • R6 is a group of formula -CH=CH2 or a group having formula (II), said method comprising a reacting step carried out under light irradiation in the presence of an iron catalyst, a heteroatomic base, and a HAT agent.
Abstract:
Using a combination of Kumada, Suzuki and Biellmann chemistry, various menaquinones can synthesised rapidly and with stereochemical integrity offering a new way of preparing these vitamin K2 components for the pharmaceutical market. In one embodiment a process for the preparation of a compound of formula (I) is defined including a step in which (i) a compound of formula (II) is reacted formula (III) wherein R is an alkyl group; LG is a leaving group; m is an integer from 0 to 8; n is an integer of from 0 to 9; and X is hydrogen, halide, hydroxyl or protected hydroxyl; in the presence of a copper, nickel or palladium catalyst.
Abstract:
The present invention discloses a new process for the preparation of 1,4-benzoquiones of formula (II) wherein R 1 , R 2, R 3 and R 4 are independently selected from the group consisting of H, branched or unbranched C 1 -C 6 alkyl, phenyl and benzyl, wherein phenyl and benzyl is optionally substituted by one or more substituent independently selected from the group consisting of C 1 -C 6 alkyl and halogen, and wherein C 1 -C 6 alkyl is optionally substituted with one or more halogen susbstituents, and wherein R 2 and R 3 together can form a C 1 -C 6 -alkylene radical, optionally substituted by one or more susbstituents independently selected from the group comprising C 1 -C 6 alkyl, benzyl, phenyl and halogen. One preferred compound is 2,3- dimethoxy-5-methyl-[l,4]benzoquinone, also known as coenzyme Q 0 (CoQ 0 ). Also disclosed are novel compounds and intermediates, and a method for the preparation of coenzyme Q n , preferable the coenzyme Q 10 . Also disclosed is a method for continuous synthesis of 1,4- benzoquiones in a continuous flow reactor.
Abstract:
The invention relates to the anthraquinone cycle for producing hydrogen peroxide using at least two differently substituted 2-alkylanthraquinones and/or their tetrahydro derivatives. According to the inventive method, the working solution to be used contains i) at least one reaction carrier from the series: 2-(4-methyl-3-pentenyl)-anthraquinone (IHEAQ), 2-(4-methylpentyl)-anthraquinone (IHAQ) and their di- and tetrahydro derivatives, such as especially, 2-(4-methylpentyl)- beta -tetrahydroanthraquinone (THIHAQ); and ii) at least one reaction carrier from the series of the 2-(C1- to C5)-alkylanthraquinones, especially 2-ethylanthraquinone (EAQ), and their tetrahydro derivatives, the reaction carriers according to i) making up 5 to 95 mol. %, especially 20 to 50 mol. % of all of the reaction carriers. The method is characterised by a greater H2O2 capacity, better hydrogenation kinetics and low susceptibility to failure. THIHAQ is also a novel substance.
Abstract:
Using a combination of Kumada, Suzuki and Biellmann chemistry, various menaquinones can synthesised rapidly and with stereochemical integrity offering a new way of preparing these vitamin K2 components for the pharmaceutical market. In one embodiment a process for the preparation of a compound of formula (I) is defined including a step in which (i) a compound of formula (II) is reacted formula (III) wherein R is an alkyl group; LG is a leaving group; m is an integer from 0 to 8; n is an integer of from 0 to 9; and X is hydrogen, halide, hydroxyl or protected hydroxyl; in the presence of a copper, nickel or palladium catalyst.
Abstract:
Process for the preparation of aloe-emodin from aloin comprising oxidizing aloin by treatment with an oxygen containing gas, in an acid reaction medium, in the presence of a copper salt catalyst.