Jin T, Suzuki S, Ho HE, Matsuyama H, Kawata M, Terada M. Pd-Catalyzed Indolization/
peri-C-H Annulation/
N-Dealkylation Cascade to Cyclopenta-Fused Acenaphtho[1,2-
b]indole Scaffold.
Org Lett 2021;
23:9431-9435. [PMID:
34851130 DOI:
10.1021/acs.orglett.1c03575]
[Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel Pd-catalyzed cascade reaction of N,N-dialkyl-substituted o-alkynylanilines involving an indolization/peri-C-H annulation/N-dealkylation sequence has been developed to construct a cyclopenta-fused acenaphtho[1,2-b]indole (ANI) scaffold. A variety of aromatic hydrocarbons having a peri-C-H bond at the alkynyl terminus, such as naphthalene, phenanthrene, pyrene, and fluoranthene, were employed, affording the corresponding π-extended ANI derivatives. The ANI molecules showed relatively narrow energy gaps by increasing HOMOs and lowering LUMOs, implying their potential applications as π-segments in low-band-gap materials.
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