The role of allyl ammonium salts in palladium-catalyzed cascade reactions towards the synthesis of spiro-fused heterocycles

Fei Ye, Yao Ge, Anke Spannenberg, Helfried Neumann and Matthias Beller ()
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Fei Ye: Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, and Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University
Yao Ge: Leibniz-Institute for Catalysis
Anke Spannenberg: Leibniz-Institute for Catalysis
Helfried Neumann: Leibniz-Institute for Catalysis
Matthias Beller: Leibniz-Institute for Catalysis

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract There is a continuous need for designing new and improved synthetic methods aiming at minimizing reaction steps while increasing molecular complexity. In this respect, catalytic, one-pot cascade methodologies constitute an ideal tool for the construction of complex molecules with high chemo-, regio-, and stereoselectivity. Herein, we describe two general and efficient cascade procedures for the synthesis of spiro-fused heterocylces. This transformation combines selective nucleophilic substitution (SN2′), palladium-catalyzed Heck and C–H activation reactions in a cascade manner. The use of allylic ammonium salts and specific Pd catalysts are key to the success of the transformations. The synthetic utility of these methodologies is showcased by the preparation of 48 spiro-fused dihydrobenzofuranes and indolines including a variety of fluorinated derivatives.

Date: 2020
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DOI: 10.1038/s41467-020-19110-3

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