摘要:
Copper(II) bromide mediated oxidation of acylated enol and use of the reaction in the synthesis of α , β -unsaturated or α -bromo ketones or aldehydes are disclosed. The method provides an efficient and practical process for manufacturing dehydrohedione (DHH) and many other versatile α,β -unsaturated or α -bromo ketones or aldehydes in large scales to avoid using precious metal compounds.
摘要:
This invention relates to novel processes for synthesizing N-(4-cyclohexyl-3-trifluoromethyl-benzyloxy)-acetimidic acid ethyl ester and to the compound of formula I and other intermediates that are used in such processes.
摘要:
Fragrances having a fresh scent are usually very volatile and therefore not very economical in typical applications, such as washing and cleaning processes. Thus, said fragrances must be used in relatively large quantities, in order to bring about appropriate effects. The invention relates to photolabile pro-fragrances that facilitate a greatly improved stability of the olfactory impression, in particular a fresh scent, in typical applications. Thus, a more economical use of the relevant fragrances is guaranteed.
摘要:
The present invention provides a compound represented by general formula (1). (In the formula, R 1 represents an alkyl group having 2 to 9 carbon atoms, an alkenyl group having 2 to 9 carbon atoms, a cyclic alkyl group having 3 to 10 carbon atoms which may have a substituent, or a phenyl group which may have a substituent; R 2 represents an alkyl group having 1 to 3 carbon atoms; R 3 to R 5 independently represent a hydrogen atom, or an alkyl group having 1 to 3 carbon atoms; R 6 represents an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, a cyclic alkyl group having 3 to 10 carbon atoms which may have a substituent, or an alkoxy group having 1 to 5 carbon atoms; n represents 0 or 1; and the wavy line represents a cis form, a trans form or a mixture of a cis form and a trans form.)
摘要:
A method of producing alpha-tocotrienol quinone or a stereoisomer thereof, the method comprising selective opening of alpha-tocotrienol chroman to alpha-tocotrienol quinone in the presence of non-alpha tocotrienol chromans by oxidizing alpha-tocotrienol with a metal salt oxidizing agent, wherein the stoichiometric ratio of metal salt oxidizing agent/alpha-tocotrienol is at least 4:1 and wherein said metal oxidizing agent is added in sequential additions, in order to reduce oxidation of any amounts of non-alpha tocotrienol chromans that might have been present in the starting alpha-tocotrienol chroman material. This process uses conditions favoring oxidation rates of the alpha tocotrienol chroman vs. the non-alpha tocotrienol chromans.
摘要:
Described herein are high yield methods for making magnolol (5,5'-diallyl-biphenyl-2,2'-diol) and tetrahydromagnolol (5,5'-dipropyl-biphenyl-2,2'-diol).
摘要:
Disclosed is a direct acid catalyzed intermolecular electrocyclic rearrangement process for the preparation of linear and cyclic homoallylic ester and amides.
摘要:
Compounds that are central nervous system drug candidates for the treatment of cognitive decline and, more particularly, Alzheimer's disease are provided. Methods for treatment, inhibition, and/or abatement of cognitive decline and/or Alzheimer's disease with a compound or pharmaceutically acceptable salt of the invention are also provided. Also provided are methods of preparing the compounds/compositions of the invention.
摘要:
The present invention provides a high-content carotenoid compound from adonis amurensis. The content of the total carotenoid of the carotenoid compound is higher than 95%. The content of all-trans (3S, 3'S)-carotenoid is higher than 80%. The carotenoid crystals have a high purity, and can be used in multiple forms in the fields of a dietary supplement of a human being, a food additive, a feed additive and a cosmetic product. In addition, the present invention also provides a method for manufacturing the compound.