Volume 58, Issue 31 pp. 10650-10654
Communication

Functionalized Contorted Polycyclic Aromatic Hydrocarbons by a One-Step Cyclopentannulation and Regioselective Triflyloxylation

M. Sc. Xuan Yang

M. Sc. Xuan Yang

Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany

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M. Sc. Marvin Hoffmann

M. Sc. Marvin Hoffmann

Theoretical and Computational Chemistry, Interdisciplinary Center for Scientific Computing (IWR), Ruprecht-Karls- Universität Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany

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Dr. Frank Rominger

Dr. Frank Rominger

Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany

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M. Sc. Tobias Kirschbaum

M. Sc. Tobias Kirschbaum

Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany

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Prof. Dr. Andreas Dreuw

Prof. Dr. Andreas Dreuw

Theoretical and Computational Chemistry, Interdisciplinary Center for Scientific Computing (IWR), Ruprecht-Karls- Universität Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany

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Prof. Dr. Michael Mastalerz

Corresponding Author

Prof. Dr. Michael Mastalerz

Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany

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First published: 24 May 2019
Citations: 38

Graphical Abstract

Better than PAH: A highly regioselective bistriflyloxylation of a polycyclic aromatic hydrocarbon (PAH) occurs during its cyclopentannulation under Scholl-type conditions. OTf moieties undergo palladium-catalyzed cross-coupling reactions, allowing simple access to larger and more complex PAHs.

Abstract

The oxidative cyclodehydrogenation (often named the Scholl reaction) is still a powerful synthetic tool to construct even larger polycyclic aromatic hydrocarbons (PAHs) by multiple biaryl bond formations without the necessity of prior installation of reacting functional groups. Scholl-type reactions are usually very selective although the resulting products bear sometimes some surprises, such as the formation of five-membered instead of six-membered rings or the unexpected migration of aryl moieties. There are a few examples, where chlorinated byproducts were found when FeCl3 was used as reagent. To our knowledge, the direct functionalization of PAHs during Scholl-type cyclization by triflyloxylation has not been observed. Herein we describe the synthesis of functionalized PAHs by the formation of five-membered rings and a regioselective triflyloxylation in one step. The triflyloxylated PAHs can be used as reactants for further transformation to even larger contorted PAHs.

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