专利号:US-6423877-B1 优先权日:1999-11-15 标题:Synthesis of pseudopterosin compounds 发明人:COREY ELIAS J 权利人:HARVARD COLLEGE 摘要:The present invention is directed to a new synthetic route to pseudopterosin aglycone (3): n a key intermediate for the synthesis of a group of antiinflammatory natural products including pseudopterosin A (1) and E (2). The pathway of synthesis starts with the abundant and inexpensive (S)-(−)-limonene and its long-known cyclic hydroboration product (4) and leads to the chiral hydroxy ketone (6). Conversion of (6) to (10) followed by a novel aromatic annulation produced (15) which underwent highly diastereoselective cyclization to afford the protected pseudopterosin aglycone (16). The naturally occurring pseudopterosins such as (1) and (2) are readily available from this key intermediate.
专利号:US-4788367-A 优先权日:1987-11-05 标题 :Synthesis of olefins from ketones using bis(alkylchloroalumino)methane 发明人:PIOTROWSKI ANDRZEJ M; MALPASS DENNIS B 权利人:TEXAS ALKYLS INC 摘要:Ketones are methylenated to form the corresponding olefin by reaction with a bis(alkylchloroalumino)methane, e.g., in the form of its dietherate.
专利号:US-4849574-A 优先权日:1987-11-05 标 题:Synthesis of olefins from ketones or aldehydes using bis(alkylchloroalumino)methane 发明人:PIOTROWSKI ANDRZEJ M; MALPASS DENNIS B 权利人:TEXAS ALKYLS INC 摘要:Ketones or aldehydes are methylenated to form the corresponding olefin by reaction with a bis(alkylchloroalumino)methane, e.g., in the form of its dietherate.
专利号:US-10717701-B2 优先权日:2017-04-07 标 题:Preparation of cyclic allylic nitro compounds 发明人:ESPINOS FERRI ESTELA; COLLADO PEREZ ANA MARIA; BAXENDALE IAN R; SHARLEY JAMES S 权利人:INT FLAVORS & FRAGRANCES INC; INT FLAVORS & FRAGRENCES INC 摘要:Amine-catalyzed formation of cyclic allylic nitro compounds via nitro-aldol reaction is disclosed. A greener solvent and a cheaper, more robust catalyst than in previous reports are used in the nitro-aldol reaction. After screening a range of catalysts the reaction is developed as a selective method of synthesis of α-dehydroherbac and the scope is demonstrated with a small collection of additional substrates.
专利号:US-11708320-B2 优先权日:2018-06-29 标 题:Environmentally-friendly hydroazidation of olefins 发明人:XU HAO 权利人:UNIV GEORGIA STATE RES FOUND 摘要:The present invention provides processes for the synthesis of organic azides, intermediates for the production thereof, and compositions related thereto.
专利号:US-3538164-A 优先权日:1968-02-08 标 题 :Synthesis of dihydrocarvone 发明人:LEFFINGWELL JOHN C 权利人:REYNOLDS TOBACCO CO R
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