Method for synthesizing oxetan-2-ones and intermediates for their
preparation
    81.
    发明授权
    Method for synthesizing oxetan-2-ones and intermediates for their preparation 失效
    合成氧杂环丁烷-2-酮及其制备方法

    公开(公告)号:US5902886A

    公开(公告)日:1999-05-11

    申请号:US8057

    申请日:1998-01-16

    摘要: A method is described for the synthesis of oxetan-2-ones comprising protection of the hydroxy group of an hydroxy ester with an acid-labile acetal protecting group, reduction of this O-protected hydroxy ester to an O-protected hydroxy aldehyde, condensation of this aldehyde with a metal enolate of an activated carboxylic acid derivative and spontaneous deprotection of the hydroxy group during the acidic workup procedure. Using the new O-protected hydroxy aldehydes as intermediates the oxetan-2-ones can be obtained after separation in diastereomerically and enantiomerically pure form, in a remarkably reduced number of steps, and in a significantly improved overall yield.

    摘要翻译: 描述了一种用于合成氧杂环丁烷-2-酮的方法,其包括用酸不稳定的缩醛保护基保护羟基酯的羟基,将该O-保护的羟基酯还原成O-保护的羟基醛,缩合 该醛与活化的羧酸衍生物的金属烯醇化物在酸性后处理过程中自发脱保护羟基。 使用新的O-保护的羟基醛作为中间体,可以以非常非对映和对映体纯的形式分离,以显着减少的步骤数量和显着提高的总产率获得氧杂环丁烷-2-酮。

    Fluorinated aldehyde containing polymers
    86.
    发明授权
    Fluorinated aldehyde containing polymers 失效
    含氟醛的聚合物

    公开(公告)号:US5512652A

    公开(公告)日:1996-04-30

    申请号:US388017

    申请日:1995-02-14

    摘要: Fluorinated aldehydes are made by reacting a fluorinated acyl chloride with a silicon hydride in the presence of palladium. Also disclosed are fluorinated ether aldehydes and their polymers, a process for making fluorinated aldehydes polymers using titanium or aluminum alkoxide catalysts, and a process for endcapping fluorinated polymers using perfluoroallyl fluorosulfate or fluorine.

    摘要翻译: 氟化醛通过在钯存在下使氟化酰氯与氢化硅反应来制备。 还公开了氟化醚醛及其聚合物,使用钛或铝醇盐催化剂制备氟化醛聚合物的方法,以及使用全氟烯丙基氟硫酸盐或氟封端氟化聚合物的方法。

    Process for producing optically active 2-norbornanone
    87.
    发明授权
    Process for producing optically active 2-norbornanone 失效
    光学活性2-降冰片酮的制备方法

    公开(公告)号:US5498799A

    公开(公告)日:1996-03-12

    申请号:US293215

    申请日:1994-08-19

    摘要: An optically active 5-methylenedioxolan-4-one derivative is subjected to Diels-Alder reaction with cyclopentadiene, and the resulting Diels-Alder reaction product is hydrolyzed to convert it into an optically active 2-hydroxynorbornene-2-carboxylic acid, which is then subjected to catalytic hydrogenation to form an optically active 2-hydroxynorbornane-2-carboxylic acid. The hydroxycarboxylic acid is subjected to oxidative decarboxylation to obtain an optically active 2-norbornanone.

    摘要翻译: 光学活性的5-亚甲基二氧杂环戊烷-4-酮衍生物与环戊二烯进行狄尔斯 - 阿尔德反应,所得的狄尔斯 - 阿尔德反应产物水解,将其转化为光学活性的2-羟基降冰片烯-2-羧酸 进行催化氢化以形成光学活性的2-羟基降冰片烷-2-羧酸。 使羟基羧酸进行氧化脱羧,得到光学活性的2-降冰片酮。