Scandium Triflate Catalyzed Nazarov Cyclization of Arylvinyl Epoxides Derived from Alkoxides and Chloro(aryl)carbenes: A Facile Access to Resveratrol-Derived Natural Products
作者:Gangarajula Sudhakar、Nagam Satish
DOI:10.1055/s-0040-1705974
日期:2021.4
The reaction of arylvinyl alkoxides with chloro(aryl)carbenes provided the corresponding arylvinyl epoxides that underwent Nazarov cyclization in a catalytic amount of scandium triflate, providing easy access to several highly substituted indenes, including some resveratrol-derived natural products.
Hydrogen‐Atom‐Transfer‐Initiated Radical/Polar Crossover Annulation Cascade for Expedient Access to Complex Tetralins
作者:Lucas Johnson、Griffin Barnes、Sebastian Fernandez、Christopher D. Vanderwal
DOI:10.1002/anie.202303228
日期:——
A radical/polarcrossover manifold permits annulations between allylarenes and Giese-type accepters, providing a route to functionalized tetralins. The reaction conditions are mild and therefore exhibit significant functional group tolerance. The annulation products are formally cycloadducts of styrenes and electron-deficient alkenes, and they can be used to form a variety of strained ring products
Generation of quaternary centers by reductive cross-coupling: shifting of regioselectivity in a subset of allylic alcohol-based coupling reactions
作者:Dexi Yang、Justin K. Belardi、Glenn C. Micalizio
DOI:10.1016/j.tetlet.2010.11.059
日期:2011.4
Regioselective titanium alkoxide-mediated reductive cross-coupling reactions of allylic alcohols with vinylsilanes and imines have previously been demonstrated to proceed with allylic transposition by formal metallo-[3,3]-rearrangement [thought to proceed by a sequence of: (1) directed carbometalation, and (2) syn-elimination]. While many examples have been described that support this reaction path, a collection of substrates have recently been identified that react by way of an alternative pathway, delivering a concise convergent route to coupled products bearing a quaternary center. (C) 2010 Elsevier Ltd. All rights reserved.
Nazarov Cyclization of Divinyl and Arylvinyl Epoxides: Application in the Synthesis of Resveratrol-Based Natural Products
作者:Gangarajula Sudhakar、Kovela Satish
DOI:10.1002/chem.201500362
日期:2015.4.20
New variation in the Nazarovcyclization has been developed by preparing divinyl and arylvinyl epoxides as pentadienyl cation precursors for the first time. Highly substituted cyclopentadienes, hydrindienes, and indenes were synthesized to demonstrate the compatibility of this reaction with substrates bearing a variety of substitutions and having different types of epoxides. Application of this method