Process for producing 2-substituted optically active
2,3-dihydro-4H-pyran-4-one
    1.
    发明授权
    Process for producing 2-substituted optically active 2,3-dihydro-4H-pyran-4-one 失效
    2-取代的光学活性2,3-二氢-4H-吡喃-4-酮的制备方法

    公开(公告)号:US5767295A

    公开(公告)日:1998-06-16

    申请号:US676973

    申请日:1996-07-08

    CPC分类号: C07D309/32 C07F7/006

    摘要: The invention provides an efficient process for producing a 2-substituted optically active 2,3-dihydro-4H-pyran-4-one comprising subjecting an aldehyde, which is not bulky and cannot be expected an electronic interaction with a catalyst, such as acetaldehyde, and a Danishefsky diene to a highly enantio-selective asymmetric hetero Diels-Alder reaction in the presence of an asymmetric catalyst readily obtainable from inexpensive starting materials.

    摘要翻译: 本发明提供了一种制备2-取代的光学活性2,3-二氢-4H-吡喃-4-酮的有效方法,其包括使醛不是大体积的,不能期待与催化剂如乙醛的电子相互作用 和Danishefsky二烯在非常易于使用的起始材料中可以获得的非对称催化剂存在下,进行高度对映异构的非对称异质Diels-Alder反应。