摘要:
The present invention relates to the field of drug synthesis, and particularly relates to an intermediate of eribulin and a synthesis method and use thereof. The present invention provides an intermediate useful for the synthesis of halichondrin B, eribulin or an analog thereof, particularly a structural fragment C27-C35 thereof, and a preparation method and use thereof. The starting materials of the synthetic route disclosed herein are cheap and easy to obtain, and the optical purity of the starting materials can be ensured, so that the optical purity of the structural fragment C27-C35 in halichondrin B, eribulin or the analog thereof is ensured; steps for constructing a chiral center of the structural fragment C27-C35 feature higher diastereoselectivity and yield, in particular preparation methods of compounds of formulae (X), (XI), (XVI) and (XV); by-products of partial reactions can be removed only by recrystallization, which results in easy purification and significant reduce in cost.
摘要:
A process for converting a multihydroxylated-aliphatic hydrocarbon or ester thereof to a chlorohydrin, by contacting the multihydroxylated-aliphatic hydrocarbon or ester thereof starting material with a source of a superatmospheric partial pressure of hydrogen chloride for a sufficient time and at a sufficient temperature, and wherein such contracting step is carried out without substantial removal of water, to produce the desired chlorohydrin product; wherein the desired product or products can be made in high yield without substantial formation of undesired overchlorinated byproducts. In addition, certain catalysts of the present invention may be used in the present process at superatmospheric, atmospheric and subatmospheric pressure conditions with improved results.
摘要:
To provide a polymerizable group-containing and fluorine-containing adamantane derivative capable of affording a cured product having good heat resistance, good mechanical properties such as mar resistance and a low refractive index, a resin composition containing such a polymerizable group-containing adamantane derivative, and a fluorine-containing adamantane derivative which is useful as a reaction intermediate used for the production of the polymerizable group-containing and fluorine-containing adamantane derivative. Specifically provided are a fluorine-containing adamantane derivative represented by the general formula (I) below, a polymerizable group-containing and fluorine-containing adamantane derivative represented by the general formula (II) below, and a resin composition containing such a polymerizable group-containing and fluorine-containing adamantane derivative. In the formula, R 1 and R 2 are each a hydrogen atom, for example, n is an integer of 0 or more, X 1 is a polymerizable group represented by the formula (III-a), for example, Y is a hydrogen atom, for example, s and t are each an integer of 1 to 15, and u is an integer of 0 to 14, with the proviso that s + t + u = 16.
摘要翻译:提供和含氟金刚烷衍生物能够得到具有良好耐热性的固化物的含有聚合性基团的,良好的机械性能:如耐擦伤性和低折射率,含寻求含聚合性基团的金刚烷衍生物的树脂组合物, 和含氟金刚烷衍生物所有作为中间体的反应用于生产含聚合性基团的含氟金刚烷衍生物的,这是有用。 下面具体地提供了由通式(I)表示的含氟金刚烷衍生物,含有聚合性基团和由下面的通式(II)表示的含氟金刚烷衍生物,和树脂组合物包含寻求可聚合基团 - 含有氟和含金刚烷衍生物。 氢在该式中,R 1和R 2各自为氢原子,对于实施例中,n是0以上的整数,X 1是由式(III-A)表示的聚合性基团,例如,Y是 核,例如,s和t各自为1至15的整数,u是0〜14的整数,前提条件做S + T + U = 16
摘要:
The invention relates to a method for enantioselective representation of optically active, propargylic, terminal epoxides. According to the invention, in a first step of the inventive method, compounds of formula I are reacted with an alcoholdehydrogenase which preferably originates from horse liver or thermophilic microorganisms (e.g. thermoanaerobium brockii or thermoanaerobacter ethanolicus) or from Lactobacillus and is recombinantly overexpressed in Escherichia coli, in the presence of NAD (P) H. During said reaction, the oxogroup is enantioselectively reduced. Since (S) selective and (R) selective oxidoreductases can be used, the synthesis of both enantiomers is possible. Representation of both enantiomers using the same enzyme is achieved with alkoholdehydrogenase from Lactobacillus brevis, since said compounds react with R1 = H and compounds with R1 = H to form alcohols having an opposite configuration. In the second step of the method, the α-halogenated alcohol is transformed into an enantiomer pure epoxide by means of a base.
摘要:
The invention discloses a method for preparation of 2-(2,3-dimethylphenyl)-1-propanal from bromo 2,3-dimethylbenzene and aceton, its use in perfumes and its use for the preparation of medetomidine.
摘要:
Process for manufacturing an epoxide, comprising consuming a first compound containing chlorine (A), generating a second compound containing chlorine (B), converting (B) into (A), and wherein the molar ratio between consumed (A) and (A) converted from (B), expressed as elemental chlorine (Cl), is higher than or equal to 0.9.
摘要:
Process for manufacturing an epoxy resin by reaction of dichloropropanol with a compound containing at least one active hydrogen atom and with a basic agent, in order to produce the epoxy resin and a salt, in which epichlorohydrin is formed in situ during the reaction.