A Pummerer-Type Novel Ring Fission of 2-Methylsulfinyl-5,6-dihydro-4<i>H</i>-1,3,4-thiadiazine Derivatives: A Homologation of Aldehydes and Ketones
作者:Kazuaki Shimada、Akihiro Otaki、Masaki Yanakawa、Shosuke Mabuchi、Naoya Yamakado、Takeshi Shimoguchi、Kazuya Inoue、Takashi Kagawa、Kazutoshi Shoji、Yuji Takikawa
DOI:10.1246/bcsj.69.1043
日期:1996.4
followed by mCPBA oxidation. The subsequent Pummerer-type ring fission of the rings was performed by treating with trifluoroacetic anhydride or trifluoromethanesulfonic anhydride at −78 °C to give α,β-unsaturated esters and ketones in modest yields. Thus, this reaction sequence was regarded as being a new method for the two-carbon homologation of aldehydes and ketones.
通过 N-亚烷基-N'-双(烷硫基)亚甲基肼的形成和碱诱导闭环,醛和酮转化为 2-甲基亚磺酰基-5,6-二氢-4H-1,3,4-噻二嗪mCPBA 氧化。随后通过在-78°C 下用三氟乙酸酐或三氟甲磺酸酐处理来进行环的 Pummerer 型环裂变,以中等产率得到 α,β-不饱和酯和酮。因此,该反应序列被认为是醛和酮双碳同系化的一种新方法。