专利号:WO-2024262824-A1 优先权日:2023-06-20 标 题 :Novel process for synthesis of polysubstituted pyridine derivatives 发明人:PARK SEUNG BUM; YI SIHYEONG 权利人:SEOUL NAT UNIV R&DB FOUNDATION 摘要:The present invention relates to a novel method for synthesizing a polysubstituted pyridine derivative and, more specifically, to a method for synthesizing a 2,3,5-substituted pyridine derivative through a specific ring cleavage reaction. In the synthesis method of the present invention, an enamine structure is formed in situ by using beta keto ester/sulfone/phosphonic acid ester and ammonium acetate and subjected to an aldol condensation reaction with 3-formyl (aza) indole/benzofuran, a cyclization reaction, and a ring-cleavage reaction in that order to synthesize a characteristic pyridine structure having an alkyl/aryl substituent attached to the 2-position thereof, an ester/sulfone/phosphonic acid ester attached to the 3-position thereof, and ortho-aminoaryl/phenol including various substituents attached to the 5-position thereof. In particular, (aza)indole/benzofuran and beta keto ester/sulfone/phosphonic acid ester, which are reaction substrates, are substrates having very high accessibility, and enable the introduction of various substituents, thereby constructing a pyridine skeleton having high biocompatibility into which ortho-aminoaryl or phenol substituents having various substituents are introduced.
专利号:US-4460786-A 优先权日:1980-07-10 标题 :Process for the selective addition of a compound having an activated carbon atom onto a substituted conjugated diene 发明人:MOREL DIDIER 权利人:RHONE POULENC IND 摘要:The selective addition of a compound having an activated carbon atom onto the carbon atom in the 4-position of a buta-1,3-diene carrying a hydrocarbon substituent on the carbon atom in the 2-position is achieved by reacting the compound having the activated carbon atom with the buta-1,3-diene carrying the hydrocarbon substituent in water or in an aqueous-alcoholic mixture in the presence of a catalyst which consists of at least one water-soluble phosphine and at least one rhodium compound, the catalyst being in solution in the water or aqueous alcoholic mixture. The products obtained are useful as precursors of intermediates for the synthesis of vitamins and perfumes.
专利号:US-4621165-A 优先权日:1983-02-24 标题 :Process for removing certain linear isoprene trimers from a mixture of isoprene trimers 发明人:MOREL DIDIER 权利人:RHONE POULENC SANTE 摘要:A process for removing from a mixture of isoprene trimers compounds of the formula ##STR1## by reacting a mixture of cyclic and linear trimers with a compound having an activated carbon atom, of the formula: n n X--CH.sub.2 --Y n n in which one of X or Y is an electron-withdrawing group and the other is an electron-withdrawing or electron-donating group, in the presence of a catalyst consisting of a water-soluble phosphine and a rhodium compound, the reaction being carried out in water or in a water-alcohol medium, and separating the cyclic trimers and linear trimers containing the chain ##STR2## from the mixture of products of the formulae: ##STR3## which can be used, in particular, in the synthesis of vitamin E.
专利号:US-4165330-A 优先权日:1972-07-31 标题 :Asymmetric synthesis via optically active chelating agents 发明人:WHITNEY THOMAS A; LANGER JR ARTHUR W 权利人:EXXON RESEARCH ENGINEERING CO 摘要:An asymmetric synthesis process which involves addition of optically active chelated organometal compounds of lithium, sodium, beryllium, magnesium, zinc, copper and cadmium to prochiral unsaturated substrates. The optically active chelating agent is not consumed and can be recycled.
专利号:CN-107188835-B 优先权日:2017-06-14 标题:A method of synthesis of a Fangya -type compound
专利号:CN-109942560-B 优先权日:2013-11-04 标 题 :Macrocyclization reactions and intermediates useful in the synthesis of analogs of halichondrin B