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公开(公告)号:US4108898A
公开(公告)日:1978-08-22
申请号:US723127
申请日:1976-09-14
IPC分类号: C07C49/403 , C07D263/52 , C07J15/00 , C07C45/00
CPC分类号: C07D263/52 , C07C45/56 , C07C45/66 , C07C45/67 , C07C45/69 , C07C45/73 , C07C49/753 , C07J15/00 , C07C2103/16
摘要: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
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公开(公告)号:US4018799A
公开(公告)日:1977-04-19
申请号:US637611
申请日:1975-12-04
IPC分类号: C07D311/58 , C11B5/00 , C07D311/20
CPC分类号: C07C255/00 , C11B5/0035
摘要: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
摘要翻译: 用作抗氧化剂的(6-羟基 - 苯并二氢吡喃-2-基)乙酸或羧酸衍生物以及在该合成中由氢醌和中间体制备这些衍生物的方法以及这些衍生物作为制备光学活性剂的中间体的用途 α-生育酚。
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公开(公告)号:US4026907A
公开(公告)日:1977-05-31
申请号:US637548
申请日:1975-12-04
IPC分类号: C11B5/00 , C07D311/72
CPC分类号: C07C255/00 , C11B5/0035
摘要: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
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公开(公告)号:US3975442A
公开(公告)日:1976-08-17
申请号:US467355
申请日:1974-05-06
IPC分类号: C07C49/27
CPC分类号: C07C49/395 , C07C45/64 , C07C45/66 , C07C45/69 , C07C2103/16
摘要: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
摘要翻译: 通过影响反应过程的光学活性剂由光学惰性反应物开始制备光学活性的有机化合物。 特别是具有“内消旋”型碳原子的光学活性化合物在光学活性剂的存在下进行分子内闭环,得到具有一个另外的环的光学活性产物。 本方法特别可用于制备在全合成类固醇中重要的中间体的光学双环二酮。
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公开(公告)号:US3947473A
公开(公告)日:1976-03-30
申请号:US417465
申请日:1973-11-19
IPC分类号: C07C59/52 , C07D311/72 , C09K15/06 , C11B5/00
CPC分类号: C07C255/00 , C07C59/52 , C07D311/72 , C09K15/06 , C10M1/08 , C11B5/0035 , C10M2207/28
摘要: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
摘要翻译: 用作抗氧化剂的(6-羟基 - 苯并二氢吡喃-2-基)乙酸或羧酸衍生物以及在该合成中由氢醌和中间体制备这些衍生物的方法以及这些衍生物作为制备光学活性剂的中间体的用途 α-生育酚。
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公开(公告)号:US4003919A
公开(公告)日:1977-01-18
申请号:US637547
申请日:1975-12-04
IPC分类号: C11B5/00 , C07D311/72
CPC分类号: C07C255/00 , C11B5/0035
摘要: The (6-hydroxy-chroman-2-yl) acetic or carboxylic acid derivatives useful as antioxidants and a method for preparing these derivatives from hydroquinones and intermediates in this synthesis as well as the use of these derivatives as intermediates in the preparation of optically active alpha-tocopherol.
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公开(公告)号:US4102929A
公开(公告)日:1978-07-25
申请号:US723130
申请日:1976-09-14
IPC分类号: C07C49/403 , C07D263/52 , C07J15/00 , C07C49/76
CPC分类号: C07D263/52 , C07C45/56 , C07C45/66 , C07C45/67 , C07C45/69 , C07C45/73 , C07C49/753 , C07J15/00 , C07C2103/16
摘要: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
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公开(公告)号:US3975440A
公开(公告)日:1976-08-17
申请号:US96597
申请日:1970-12-09
IPC分类号: C07C69/716 , C07C20060101 , C07C45/00 , C07C45/73 , C07C49/385 , C07C49/395 , C07C49/493 , C07C49/623 , C07C51/00 , C07C59/205 , C07C67/00 , C07D263/52 , C07D317/46 , C07D317/54 , C07D325/00 , C07J1/00
CPC分类号: C07C2103/16
摘要: Optically active organic compounds are prepared starting from optically inactive reactants by means of an optically active agent which influences the course of the reaction. In particular optically active compounds having a "meso" type carbon atom undergo an intramolecular ring closure in the presence of an optically active agent to yield an optically active product having one additional ring. The present process is particularly useful in the preparation of optically active bicyclic diketones which are important intermediates in the total synthesis of steroids.
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