Cyclopropyl ketone (13),
prepared by the copper-catalysed decomposition of diazoketone (12), underwent
specific cyclopropyl bond fission on reduction with lithium in liquid ammonia.
Oxidation of the reaction product mixture followed by catalytic hydrogenation
gave ketone (7) whose stereo-chemistry was established by degradation to trans-decalyl- 9-acetic acid (18), an authentic sample of which
was prepared from trans-decalin-9-carboxylic acid. Ketone (7) was converted via
its methylene derivative (21) to the pyrrolidinium
salt (24) which underwent base induced [2,3]sigmatropic rearrangement, followed
by hydrolysis, to give aldehyde (26). Acid (5) was formed by simple oxidation
and converted by base catalysed isomerization of its methyl ester, then
hydrolysis, into acid (6).
环丙基酮(13)、
通过
铜催化分解重
氮酮 (12) 而制备,在液
氨中用
锂还原时,环丙基键会发生特定的裂解。
在液
氨中用
锂还原时发生特定的环丙基键裂变。
反应产物混合物氧化后催化加氢
酮(7),其立体
化学性质是通过降解生成反式-癸基-9-
乙酸(18)而确定的。
的真实样品。酮 (7) 通过其亚甲基衍
生物 (21)
其亚甲基衍
生物 (21) 转化为
吡咯烷鎓盐 (24)。
盐 (24) 经过碱诱导的 [2,3]sigmatropic 重排反应,然后
水解
水解,得到醛 (26)。酸 (5) 通过简单的氧化反应生成
通过碱催化其甲酯的异构化,然后
水解,转化成酸 (6)。
水解,转化成酸 (6)。