example of the direct halosulfenylation of benzo[b]furans with commercially available disulfides and N-halosuccinimides has been achieved, providing an efficient metal-free synthetic pathway to access diverse 3-halo-2-thiobenzo[b]furans in moderate to excellent yields. In particular, a halogen (e.g., bromo or iodo) substituent on the benzo[b]furan ring is amenable for further synthetic elaborations
苯并[ b ]呋喃与市售二硫化物和N-卤代琥珀酰亚胺直接卤代亚磺酰化的第一个例子已经实现,它提供了一种有效的无金属合成途径,以中等到中等的程度使用各种3-卤-2-硫代苯并[ b ]呋喃。优异的产量。特别地,苯并[ b ]呋喃环上的卤素(例如,溴或碘)取代基适于进一步合成合成,从而扩大了产物的多样性。
2,3-Functionalization of furans, benzofurans and thiophenes via magnesiation and sulfoxide–magnesium exchange
作者:Laurin Melzig、Christian B. Rauhut、Paul Knochel
DOI:10.1039/b907330b
日期:——
The use of TMPMgCl·LiCl and iPrMgCl·LiCl allows a sequential 2,3-difunctionalization of various 2-arylsulfinyl furans, thiophenes and benzofurans. Subsequent use of the same reagents permits a selective full functionalization of all 4 positions of the furan and thiophene scaffolds.