The influence of 1,3-oxazolidine and 1,3-oxathiolane fragments in substituted alkenes on the direction of their catalytic reaction with diazomethane has been investigated. The olefins bearing an oxazolidine substituent in the α- or γ-position and an oxathiolane substituent in the γ-position relative to the C=C bond react with diazomethane in the presence of Pd(acac)2 selectively resulting in cyclopropanation
研究了取代烯烃中
1,3-恶唑烷和 1,3-氧杂
硫杂
环戊烷片段对其与
重氮甲烷催化反应方向的影响。在相对于 C=C 键的 α-或 γ-位带有
恶唑烷取代基和在 γ-位带有氧杂
硫杂
环戊烷取代基的烯烃在 Pd(acac)2 存在下与
重氮甲烷反应,选择性地产生
环丙烷化产物。Cu(OTf)2 的使用不会导致
环丙烷化;然而,Cu(OTf)2 催化
重氮甲烷与 2-(alk-1-enyl)-1,3-oxathiolanes 的反应,生成 2,3,5,6-四氢-1,4-oxathiocines 通过 [2,3 ]-中间体锍叶立德的sigmatropic重排。