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Beilstein J. Org. Chem. 2021, 17, 396–403, doi:10.3762/bjoc.17.35
Graphical Abstract
Scheme 1: Conventional methods for the synthesis of helicenes.
Scheme 2: Brønsted acid-catalyzed cycloaromatization of biaryls bearing an acetal moiety.
Scheme 3: Two strategies for the helicene synthesis via Suzuki–Miyaura coupling/cycloaromatization sequence.
Scheme 4: Synthesis of (a) [5]helicene and (b) [6]helicene.
Scheme 5: Synthesis of helicenes with double helical structures.
Scheme 6: Synthesis of hetero[4]-, [5]-, and [6]helicenes.
Beilstein J. Org. Chem. 2017, 13, 2682–2689, doi:10.3762/bjoc.13.266
Scheme 1: Intramolecular site-selective iodoarylation of 1,1-difluoro-1-alkenes bearing a biaryl group.
Scheme 2: Mechanism for formation of 3a.
Figure 1: ORTEP diagram of 2a with 50% ellipsoid probability.
Scheme 3: Transformation of a CF2I group of 2a into a CHF2 group.
Scheme 4: Construction of seven-membered carbocycles via iodoarylation of 5.
Figure 2: ORTEP diagram of 6a with 50% ellipsoid probability.
Scheme 5: Selective HI elimination from 6a.