Electrochemically driven regioselective construction of 4-sulfenyl-isochromenones from o-alkynylbenzoates and diaryl disulfides
摘要:
Herein, we have developed an electrochemical technique that enables the regioselective construction of 4-sulfenyl-1H-isochromen-1-ones in an undivided cell under external acid, catalyst, oxidant, or metal-free conditions.
Facile synthesis of sulfenyl-substituted isocoumarins, heterocycle-fused pyrones and 3-(inden-1-ylidene)isobenzofuranones by FeCl3-promoted regioselective annulation of o-(1-alkynyl)benzoates and o-(1-alkynyl)heterocyclic carboxylates with disulfides
作者:Zhen Li、Jianquan Hong、Linhong Weng、Xigeng Zhou
DOI:10.1016/j.tet.2011.12.003
日期:2012.2
Reported herein is the FeCl3-promoted intermolecular sulfoesterification of o-(1-alkynyl)benzoates with disulfides, which provides a convenient and efficient method for synthesis of 4-sulfenylisocoumarins. Various functional groups such as methoxy, halides, ester, cyano and silicon groups in the substrates are tolerated, and heterocycle-fused chalcogenylpyrones are also successfully achieved directly
Brønsted Acid Promoted Sulfenylacyloxylation of Alkynes: Access to 4‐Sulfenylisocoumarins
作者:Arijit Saha、E. Ramesh、Akhila K. Sahoo
DOI:10.1002/adsc.202200761
日期:2022.10.18
Presented herein is the Brønsted acid (MsOH) mediated electrophilic sulfenylacyloxylation of o-alkynylbenzoates via alkyne activation by in-situ formed sulfonium cations from bench-stable N-thioaryl/alkyl-succinimides followed by the intramolecular regioselective cyclization. The transformation provides access to structurally diverse 4-sulfenylisocoumarins in 77–98% yields with broad functional group