Synthesis of 3,6-Dihydro-2<i>H</i>-1,2-oxazines via Dimethylsulfoxonium Methylide Addition to α,β-Unsaturated Nitrones
作者:Megumi Hasegawa、Takuya Suga、Takahiro Soeta、Yutaka Ukaji
DOI:10.1021/acs.joc.0c01349
日期:2020.9.4
starting from α,β-unsaturated nitrones has been achieved. The nucleophilic addition of dimethylsulfoxonium methylide to the C═N bond of an α,β-unsaturated nitrone to form an aziridine N-oxide followed by the Meisenheimer rearrangement affords 3,6-dihydro-2H-1,2-oxazine in up to 70% yield. Methylene was confirmed to be incorporated at the C3 position of the ring. A wide range of β-aryl-substituted α,β-unsaturated
从α,β-不饱和的硝酮开始,独特而有效地形成了3,6-二氢-2 H -1,2-恶嗪。二甲亚砜基亚甲基的亲核加成,形成一个α,β-不饱和硝酮的C═N键,形成氮丙啶N-氧化物,然后进行迈森海默重排,得到3,6-二氢-2 H -1,2-恶嗪产率70%。证实在环的C 3位置结合了亚甲基。广泛的β-芳基取代的α,β-不饱和硝酮可用于该反应。