Pd‐Catalyzed Annulation of β‐Iodovinyl Sulfones with 2‐Halophenols: A General Route for the Synthesis of 3‐Sulfonyl Benzofuran Derivatives
作者:Raju Jannapu Reddy、Jangam Jagadesh Kumar、Arram Haritha Kumari、Gamidi Rama Krishna
DOI:10.1002/adsc.201901550
日期:2020.3.17
The palladium‐catalyzed annulation between β‐iodovinyl sulfones and 2‐halophenols or 1‐bromo‐2‐naphthol or 2‐bromo‐3‐pyridinol is presented. The annulation process involving oxa‐Michael addition‐elimination and intramolecular Heck reaction leading to form 2,3‐disubstituted benzofurans (aryl benzofuryl sulfones) in good to high yields. The regioselective tandem construction of C−O and C−C bonds has
提出了β-碘乙烯基砜与2-卤代苯酚或1-溴-2-萘酚或2-溴-3-吡啶醇之间的钯催化环化反应。涉及氧杂-迈克尔加成消除和分子内Heck反应的环化过程导致形成2,3-二取代的苯并呋喃(芳基苯并呋喃砜),产率高至高。C-O和C-C键的区域选择性串联结构已通过多种取代方式实现。此外,串联过程在克级反应中是可靠的,并且提出了合理的机制。