申请人:Canadian Patents & Development Limited
公开号:US04070366A1
公开(公告)日:1978-01-24
Substituted pyrrole compounds, such as 3-ethyl-4-methyl-5-carbethoxy pyrrole, 2,4-dimethyl-3-acetyl pyrrole and 2-methyl-5-carboxy pyrrole-4-propionic acid diethyl ester, are alkylated in a single step by reaction with an aldehyde or ketone in the presence of both an acid condensing agent such as hydriodic acid and a compatible reducing agent such as metallic zinc or stannous chloride. Suitable carbonyl reactants include formaldehyde, paraldehyde, isobutyraldehyde, acetone, cyclohexanone and methyl-isobutyl ketone. This application is a continuation application of U.S. application Ser. No. 281,624 filed Aug. 18, 1972, now abandoned, which is a continuation-in-part application of U.S. application Ser. No. 832,001, filed June 10, 1969, now abandoned.
取代
吡咯化合物,例如3-乙基-4-甲基-5-羧乙氧基
吡咯,
2,4-二甲基-3-乙酰基吡咯和2-甲基-5-羧基
吡咯-4-
丙酸二
乙酯,可以在存在酸
缩合剂(如
氢碘酸)和兼容的还原剂(如
金属
锌或
氯化亚锡)的情况下,通过与醛或酮反应进行单步烷基化。适当的羰基反应物包括
甲醛、对
甲醛、
异丁醛、
丙酮、
环己酮和
甲基异丁基酮。本申请是美国申请号281,624于1972年8月18日提交的继续申请,该申请是美国申请号832,001于1969年6月10日提交的续分申请,现已废弃。