179 results about "Benzopyrans" patented technology

The invention discloses a novel preparation method of pranoprofen. The novel preparation method of the pranoprofen has the advantages of being high in yield, having less impurities, and being safe andenvironmentally friendly. The novel preparation method of the pranoprofen comprises the following steps that step 1, 5H-[1]-benzopyran[2,3-b]pyridine and propionyl chloride are directly acylated; step 2, bromination is carried out; step 3, potassium tert-butoxide or sodium tert-butoxide is used for hydrolysis, and finally, rearrangement is carried out to obtain the pranoprofen.

A therapeutic compound has a modified phenolic compound of the general formula (I)

The present invention discloses liquid crystal compounds having dibenzopyran derivatives with cycloalkyl groups, and preparation methods and application thereof. The liquid crystal compounds having dibenzopyran derivatives with cycloalkyl terminal groups, shown in formula I, exhibit better miscibility and a very large negative dielectric constant, compared to those having a flexible alkyl chain as a terminal group, therefore the compounds of the present invention, shown in formula I, may improve the miscibility of liquid crystal compounds and broaden the application range of liquid crystal mixtures. In addition, the compounds may also increase the negative dielectric constants of liquid crystal mixtures, having an important application value.

The invention discloses a benzopyranone compound, as well as a preparation method and an application thereof, belonging to the field of synthesis of medicaments. The method comprises the following steps of: based on 1, 4-benzopyrandione and p-tert-butyl cyclohexyl acetaldehyde as raw materials, performing condensation reaction to get 3-((4-tert-butyl-cyclohexyl) dimethylene)-1, 4-benzopyrandione. The invention further discloses the method for preparing buparvaquone by utilizing the compound. The method has the characteristics of simple synthesis method, effect of avoiding the use of AgNO3, high total yield and the like.

The invention relates to a composition comprising a lupin total extract consisting of a lupin sugar extract, comprising at least 50 % galactooligosacharides by weight, in relation to the weight of dry matter, and a lupin peptide extract. The composition can also contain a chromane derivative or a chromene derivative. The invention also relates to a pharmaceutical and/or cosmetic composition comprising said lupin total extract, used advantageously as an anti-inflammatory agent, which repairs the cutaneous barrier and heals, used particularly in the prevention and/or treatment of erythemas.

Provided are benzopyran compounds of formula I, for example, pomiferin-3′,4′-dimethyl ether, and the use of such compounds and compositions thereof to modulate (e.g., inhibit) melanogenesis and pigmentation.

wherein R³, R⁴, R⁵, R⁶, R⁷ and R⁸ are described herein. Also provided are plant extracts containing a compound of formula I, and the use of such a plant extract to modulate (e.g., inhibit) melanogenesis and pigmentation. The compound or plant extract may be prepared as pharmaceutical and cosmetic compositions, and may be used for the prevention and treatment of conditions that are related to aberrant melanogenesis activity.

The invention provides a method for manufacturing a smart light-controlled insulating window membrane, which aims to solve the problems of low efficiency for blocking ultraviolet and infrared rays, low speed of light-controlled color-changing and recovery, poor using comfortable feeling and the like in the prior art. According to the technical scheme, the method is characterized by comprising the following steps: manufacturing a first functional membrane; manufacturing a second functional membrane; combining the first functional membrane and the second functional membrane; coating a transparent wearing layer; and coating a pressure-sensitive adhesive layer and a composite release type PET membrane, wherein the top surface of a first optical PET membrane which is subjected to corona treatment or coated with a PU easy bonding layer is coated with a metal oxide insulating coating mixed with stannic oxide and antimony trichloride particles, and is coated with an intelligent light-controlled color-changing coating mixed with tungsten trioxide particles and benzopyran when the first functional membrane is manufactured; and when the second functional membrane is manufactured, an ultraviolet absorber is added in the process of forming a second optical PET membrane, or a nichrome metal insulating layer is plated to the bottom of the second optical PET membrane.

A preparing method of tetrahydro benzopyran derivatives is disclosed. The method adopts cyclodextrin as a catalyst, adopts aromatic aldehyde, dimedone and malononitrile as raw materials and adopts water, ethanol or methanol as a solvent. A reaction is performed at 15-30 DEG C, and the tetrahydro benzopyran derivatives can be prepared by recrystallization or column chromatography separation after the reaction is finished. The method is mild in reaction conditions, short in process steps, simple and convenient in operation, low in cost and high in yield, and has a good industrial application prospect.

The invention discloses a preparing method of (E)-N'-arylmethylene-4-(coumarin-3-yl)thiazole-2-hydrazide compound and its application. A formula (I) of the compound is shown as below. The preparing method includes: making salicylic aldehyde and ethyl acetoacetate into 3-acetylindole-2H-chromene-2-one, allowing bromization, cyclization and hydrazinolysis to obtain 4-(2-oxo-2H-chromene-3-yl)thiazole-2-hydrazine, and allowing the 4-(2-oxo-2H-chromene-3-yl)thiazole-2-hydrazine to react with substituted benzaldehydes to obtain the target compound. The compound can serve as a raw material for antiseptic medicine; the preparing method has the advantages that the raw materials are simple and easy to obtain and operating is convenient.

The present invention is directed to methods of stimulating hair growth by administering particular benzopyran compounds.

The invention relates to a preparation method and an application of 2-(4-beta-D-allose pyranoside-phenyl)-2,3-dihydroquinoline-4(1H) (1) and 2-(4-(2,3,4,6-tetrabenzyl)-beta-D-allose pyranoside-phenyl)-2,3-benzodihydropyran (2). The invention discloses helicide derivatives with a central nervous system improving function, and a preparation method thereof. The compounds provided by the invention have good sedative, sleep-promoting, and convulsion-inhibiting functions. The compounds are collected in a Year 2000 version of Pharmacopoeia of PRC with a medicine name of helicide tablets. The helicide derivative novel medicines are represented by chemical formulas (1) and (2), wherein R1 can be hydrogen and acetyl, and R2 can be semicarbazide, hydroxylamine, and methoxylamine. Acording to the helicide derivatives provided by the invention, a plant active monomer helicide with sedative, sleep-promoting, and convulsion-inhibiting functions is adopted as a matrix compound, structural modification is carried out according to a medicine efficacy molecular principle, and compounds with high activities for improving central nervous system functions are designed and prepared.