作者:Gen-ichi Tsuchihashi、Katsuyuki Ogura
DOI:10.1246/bcsj.45.2023
日期:1972.7
Ghloromethyl methyl sulfoxide undergoes a Darzens-type reaction with carbonyl compounds in the presence of potassium t-butoxide in t-butanol to afford methylsulfinyloxirane derivatives. The stereochemistry of this reaction has been studied. The reaction with a symmetrical ketone appeared to proceed stereospecifically to give only one isomer. On the other hand, the reaction with unsymmetrical ketones such as pinacolone or acetophenone produced a mixture of two diastereoisomers, in which a thermodynamically unstable isomer was predominant. The reaction with thiobenzophenone gave 1,1-diphenyl-2-methylsulfinylethylene which seems to have been formed from the intermediacy of 2,2-diphenyl-3-methylsulfinylthiirane. Mechanisms of these reactions are also discussed.
氯甲基甲基亚砜在叔丁醇中与碳基化合物在叔丁氧化钾的存在下进行Darzens型反应,生成甲基亚砜氧杂环烷烃衍生物。该反应的立体化学已被研究。与对称酮的反应似乎以立体专一的方式进行,只生成一种异构体。另一方面,与不对称酮(如二氧戊酮或乙酰苯酮)的反应则产生了两种非对映异构体的混合物,其中热力学上不稳定的异构体占据主导地位。与硫苯甲酮的反应生成了1,1-二苯基-2-甲基亚砜乙烯,似乎是通过2,2-二苯基-3-甲基亚砜噁唑的中间体形成的。这些反应的机制也进行了讨论。