Synthesis of Phenacene−Helicene Hybrids by Directed Remote Metalation
Peer reviewed, Journal article
Published version
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https://hdl.handle.net/11250/2756492Utgivelsesdato
2020-08Metadata
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Originalversjon
Kancherla, S., Jørgensen, K.B. (2020) Synthesis of Phenacene−Helicene Hybrids by Directed Remote Metalation. Journal of Organic Chemistry, 85(17), 11140-11153. 10.1021/acs.joc.0c01097Sammendrag
Polycyclic aromatic hydrocarbons (PAHs) with six and seven rings were synthesized via directed metalation and cross-coupling of chrysenyl N,N-diethyl carboxamides with o-tolyl and methylnaphthalenyl derivatives. In the presence of competing ortho sites, the site selectivity in iodination of chrysenyl amides by directed ortho metalation (DoM) was influenced by the lithium base. The catalyst ligand bite angle was presumably important in the cross-coupling of sterically hindered bulky PAHs. Subsequent directed remote metalation of biaryls under standard conditions and at elevated temperatures afforded various fused six- and seven-ring PAHs, all in good yields and with fluorescent properties.