Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone
    6.
    发明授权
    Method for preparing 4-hydroxy-3-methyl-2-(2-propynyl)-2-cyclopentenolone 失效
    4-羟基-3-甲基-2-(2-丙炔基)-2-环戊烯醇的制备方法

    公开(公告)号:US4343953A

    公开(公告)日:1982-08-10

    申请号:US159497

    申请日:1980-06-16

    摘要: The present invention relates to a novel method for producing cyclopentenolone of the formula (I), ##STR1## which is a useful intermediate for producing agricultural chemicals, which comprises reacting an acetonedicarboxylic ester of the formula (VII), ##STR2## wherein R is a C.sub.1 -C.sub.6 alkyl group, with 2-propynyl chloride in the presence of magnesium alkoxide and in the presence of alkali iodide to obtain novel mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI), ##STR3## wherein R is as defined above; hydrolyzing the mono-(2-propynyl)-substituted acetonedicarboxylic ester of the formula (VI) under alkaline conditions with an alkali and then reacting the hydrolyzed product with methylglyoxal of the formula, ##STR4## to obtain novel .gamma.-diketone of the formula (V), ##STR5## and ring-closing the .gamma.-diketone of the formula (V) under alkaline condition.

    摘要翻译: 本发明涉及一种制备式(I)的环戊烯醇酮的新方法,其是用于生产农药的有用的中间体,其包括使式(VII)的丙酮二羧酸酯, (Ⅶ)其中R是C 1 -C 6烷基,与2-丙炔基氯在烷氧基镁存在下,在碱金属碘化物的存在下,得到式(Ⅵ)的新型单 - (2-丙炔基) - 取代的丙酮二羧酸酯 ),其中R如上定义; 在碱性条件下用碱水解式(Ⅵ)的单 - (2-丙炔基) - 取代的丙二酸二羧酸酯,然后使水解产物与下式的甲基乙二醛反应,得到式(Ⅵ)的新的γ-二酮 V),(V)并在碱性条件下闭合式(V)的γ-二酮。