Pummerer Synthesis of Chromanes Reveals a Competition between Cyclization and Reductive Chlorination
作者:Paola Acosta-Guzmán、Alvaro Rodríguez-López、Diego Gamba-Sánchez
DOI:10.1021/acs.orglett.9b02520
日期:2019.9.6
chlorination and the Pummerer reaction was studied and applied to the synthesis of benzofused oxygen heterocycles including 3-aminochromanes and in the intramolecular chlorination of activated aromatic rings. The use of (COCl)2 as a Pummerer activator showed substantial activity, producing α-chlorinated sulfides that can undergo Pummerer-Friedel-Crafts cyclization. If the aromatic ring has electron-donating
研究了前所未有的还原氯化反应与Pummerer反应之间的竞争,并将其应用于包括3-氨基苯并烷的苯并稠合氧杂环的合成以及活化芳环的分子内氯化反应。(COCl)2作为Pummerer活化剂的使用显示出显着的活性,产生可以进行Pummerer-Friedel-Crafts环化反应的α-氯化硫化物。如果芳环在位置3具有给电子基团,则反应遵循不同的途径,产生还原性氯化产物,其中氯原子来自a盐。