专利号:US-11680224-B2 优先权日:2020-11-04 标 题:Hydroxy fatty acid synthesis 发明人:CERMAK STEVEN C; Isbell Terry; LOWERY BENJAMIN A 权利人:US AGRICULTURE; THE US SECRATERY OF AGRICULTURE 摘要:The invention relates to methods for the synthesis of hydroxy fatty acids from unsaturated fatty acids via epoxidation and catalytic hydrogenation.
专利号:US-8927739-B2 优先权日:2011-05-18 标 题 :Processes for the preparation of 5-azaspiro[2.4]heptane-6-carboxylic acid and its derivatives 发明人:QIU YAO-LING; PENG XIAOWEN; KIM IN JONG; CAO HUI; TANG DATONG; OR YAT SUN; WANG GUOQIANG; XU GUOYOU 权利人:ENANTA PHARM INC 摘要:The present invention relates generally to an improved process for the preparation of 5-azaspiro[2.4]heptane-6-carboxylic acid and its derivatives which are useful intermediates in the synthesis of biologically active molecules, especially in the synthesis of hepatits C virus NS5A inhibitors. In particular, the present invention relates to processes and intermediates for the preparation of compounds of formulae (Ia), (Ib) and (Ic):
专利号:US-6288297-B1 优先权日:1998-10-01 标 题:Process for the preparation of cyclopropylacetylene 发明人:WANG ZHE; YIN JIANGUO; FORTUNAK JOSEPH M; CAMPAGNA SILVIO 权利人:DU PONT PHARM CO 摘要:The present invention relates generally to novel methods for the synthesis of cyclopropylacetylene which is an essential reagent in the asymmetric synthesis of (S)-6-chloro-4-cyclopropylethynyl-4-trifluoromethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one; a useful human immunodeficiency virus (HIV) reverse transcriptase inhibitor. In the process, for example, cyclopropane carboxaldehyde is alkylated to form 1,1,1-trichloro-2-cyclopropyl-ethanol; which in turn is hydroxy protected to form 1,1,1-trichloro-2-cyclopropylethyltosylate; which in turn undergoes elimination to form cyclopropyl acetylene. This improvement provides for high conversion of inexpensive, readily available starting materials into cyclopropylacetylene, high overall yields and can be conducted on an industrial scale.
专利号:WO-2009049476-A1 优先权日:2007-09-20 标题 :Process for the manufacture of (+)-biotin 发明人:CHEN FEN-ER; DAI HUI-FANG; HUANG JIAN; XIONG FEI; JING SHU-PING 权利人:DSM IP ASSETS BV; UNIV FUDAN; CHEN FEN-ER; DAI HUI-FANG; HUANG JIAN; XIONG FEI; JING SHU-PING 摘要:Disclosed are processes for preparing synthetic biotin intermediates and a process for preparing biotin using said intermediates. In particular, disclosed is a process for the stereoselective total synthesis of the natural product (+)-biotin of formula (I).
专利号:US-2021163438-A1 优先权日:2017-08-16 标题 :Synthesis of phytocannabinoids including a demethylation step 发明人:REEKIE TRISTAN; SCOTT MICHAEL; KASSIOU MICHAEL 权利人:UNIV SYDNEY 摘要:A method for demethylating a methylated phytocannabinoid compound of Formula I to form a phytocannabinoid compound of Formula II: Formula I Formula II wherein: R1 is selected from the group consisting of: substituted or unsubstituted C1-C5 alkyl; R2 is selected from the group consisting of: OH or O, and R3 is selected from the group consisting of: a substituted or unsubstituted cyclohexene, a substituted or unsubstituted C2-C8 alkene, or a substituted or unsubstituted C2-C8 dialkene; or R2 is O, and R2 and R3 together form a ring structure in which R2 is an internal ring atom; wherein the method includes: heating a reaction mixture comprising the methylated phytocannabinoid compounds and a polar aprotic solvent in the presence of a dissolved inorganic alkaline salt for a time sufficient to demethylate at least a portion of the methylated phytocannabinoid compounds and form the phytocannabinoid compound.
专利号:US-7667034-B2 优先权日:2004-06-23 标题:Chemical synthesis of S-adenosyl-L-methionine with enrichment of (S,S)-isomer 发明人:SENTHILKUMAR UDAYAMPALAYAM PALANISAMY; PADMANABHAN RAMAR; SIVASANKARAN VENUGOPAL; MOHAN SINGARAVEL 权利人:ORCHID CHEMICALS & PHARM LTD 摘要:This invention relates to an improved process for the industrial manufacture of S-adenosyl-L-methionine (SAMe) of formula (I), which consists of stereo-selective methylation of S-adenosyl-L-homocysteine (SAH) with the enrichment of active (S,S)-isomer.