Iron(II)-Catalyzed Sulfimidation and [2,3]-Sigmatropic Rearrangement of Propargyl Sulfides with tert-Butoxycarbonyl Azide. Access to N-Allenylsulfenimides
摘要:
The iron(II)-catalyzed Bach reaction of tert-butoxycarbonyl azide (BocN(3)) and allyl sulfides has been extended to include propargyl sulfides, which give N-allenylsulfenimide products. Using 10 mol % dppeFeCl(2) as catalyst the reaction proceeds at 0 degreesC with a number of different propargyl sulfides in 31-73% isolated yield. The reaction is limited by product instability toward catalyst and termination of the catalytic cycle by excess BocN3. N-Allenylsulfenimide 2b smoothly undergoes catalytic hydrogenation and a Diels-Alder reaction with cyclopentadiene.
Catalytic Activation of Diazo Compounds Using Electron-Rich, Defined Iron Complexes for Carbene-Transfer Reactions
作者:Michael S. Holzwarth、Isabel Alt、Bernd Plietker
DOI:10.1002/anie.201201409
日期:2012.5.29
transfer: The electron‐rich iron complex Bu4N[Fe(CO)3(NO)] efficientlycatalyzes different carbene‐transfer reactions. Various diazo compounds can be used. The high stability of the employed iron complexes is demonstrated by the generation of the diazo reagent in situ and a sequential iron‐catalyzed allylic sulfenylation/Doyle–Kirmse reaction.
碳转移:富电子的铁络合物Bu 4 N [Fe(CO)3(NO)]有效催化不同的卡宾转移反应。可以使用各种重氮化合物。重氮试剂的原位生成和连续的铁催化的烯丙基亚磺酰化/道尔-柯尔姆斯反应证明了所用铁配合物的高稳定性。