γ-Amino Alcohols via Energy Transfer Enabled Brook Rearrangement

γ-Amino Alcohols via Energy Transfer Enabled Brook Rearrangement

2024 | Ranjini Laskar, Subhabrata Dutta, Jan C. Spies, Poulami Mukherjee, Ángel Rentería-Gómez, Rebecca E. Thielemann, Constantin G. Daniliuc, Osvaldo Gutierrez, and Frank Glorius
This study presents a method for the synthesis of γ-amino alcohols via energy transfer (EnT) photocatalysis using bifunctional reagents. The approach enables the direct formation of γ-amino alcohols from alkenes through a radical chain propagation pathway, involving a radical Brook rearrangement. The reagents, designed with a 1,3-linkage, undergo homolysis under visible light, leading to radical intermediates that undergo a radical Brook rearrangement to form the target product. The reaction is highly selective, with the persistent radical effect (PRE) enhancing the selectivity by differentiating the lifetimes of the radicals involved. The study demonstrates a broad substrate scope, including various alkenes with different functional groups, and shows the ability to produce γ-amino alcohols in good yields. The mechanism was supported by computational studies, which revealed a radical chain propagation pathway involving EnT. The method offers a promising approach for the efficient synthesis of γ-amino alcohols, which are important building blocks in pharmaceuticals and other chemical applications. The work highlights the potential of energy transfer photocatalysis in enabling new synthetic pathways for complex molecules.This study presents a method for the synthesis of γ-amino alcohols via energy transfer (EnT) photocatalysis using bifunctional reagents. The approach enables the direct formation of γ-amino alcohols from alkenes through a radical chain propagation pathway, involving a radical Brook rearrangement. The reagents, designed with a 1,3-linkage, undergo homolysis under visible light, leading to radical intermediates that undergo a radical Brook rearrangement to form the target product. The reaction is highly selective, with the persistent radical effect (PRE) enhancing the selectivity by differentiating the lifetimes of the radicals involved. The study demonstrates a broad substrate scope, including various alkenes with different functional groups, and shows the ability to produce γ-amino alcohols in good yields. The mechanism was supported by computational studies, which revealed a radical chain propagation pathway involving EnT. The method offers a promising approach for the efficient synthesis of γ-amino alcohols, which are important building blocks in pharmaceuticals and other chemical applications. The work highlights the potential of energy transfer photocatalysis in enabling new synthetic pathways for complex molecules.
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