Iodane-Guided ortho C−H Allylation

Wei W. Chen, Anton Cunillera, Dandan Chen, Sébastien Lethu, Albert López de Moragas, Jun Zhu, Miquel Solà, Ana B. Cuenca, Alexandr Shafir

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Resum

A metal-free C−H allylation strategy is described to access diverse functionalized ortho-allyl-iodoarenes. The method employs hypervalent (diacetoxy)iodoarenes and proceeds through the iodane-guided “iodonio-Claisen” allyl transfer. The use of allylsilanes bearing electron-withdrawing functional groups unlocks the functionalization of a broad range of substrates, including electron-neutral and electron-poor rings. The resulting ortho-allylated iodoarenes are versatile building blocks, with examples of downstream transformation including a concise synthesis of the experimental antimitotic core of Dosabulin. DFT calculations shed additional light on the reaction mechanism, with notable aspects including the aromatic character of the transition-state structure for the [3,3] sigmatropic rearrangement, as well as the highly stereoconvergent nature of the trans-product formation.

Idioma originalAnglès
Pàgines (de-a)20201-20207
Nombre de pàgines7
RevistaAngewandte Chemie - International Edition
Volum59
Número45
DOIs
Estat de la publicacióPublicada - 2 de nov. 2020

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