Synthesis 2025; 57(04): 855-875
DOI: 10.1055/a-2493-3436
paper

Consecutive Sonogashira–Suzuki–Michael Cyclization: Three-Component Synthesis of Phenanthridines and Benzo[c]chromenes

G. Hendrik Schmitz
a   Heinrich-Heine-Universität Düsseldorf, Math.-Nat. Fakultät, Institut für Organische Chemie und Makromolekulare Chemie, Universitätsstraße 1, 40225 Düsseldorf, Germany
,
Leonard Karl
b   Heinrich-Heine-Universität Düsseldorf, Math.-Nat. Fakultät, Institut für Anorganische Chemie und Strukturchemie, Universitätsstraße 1, 40225 Düsseldorf, Germany
,
Christian Ganter
b   Heinrich-Heine-Universität Düsseldorf, Math.-Nat. Fakultät, Institut für Anorganische Chemie und Strukturchemie, Universitätsstraße 1, 40225 Düsseldorf, Germany
,
Thomas J. J. Müller
a   Heinrich-Heine-Universität Düsseldorf, Math.-Nat. Fakultät, Institut für Organische Chemie und Makromolekulare Chemie, Universitätsstraße 1, 40225 Düsseldorf, Germany
› Author Affiliations
The authors gratefully acknowledge financial support by the Fonds der Chemischen Industrie.


Dedicated to Prof. Dr. Hans-Ulrich Reissig on the occasion of his 75th birthday

Abstract

The equistoichiometric three-component reaction of an acid chloride, an alkyne, and an ortho-amino- or ortho-hydroxyphenylboronic ester proceeds smoothly to give phenanthridines or benzo[c]chromenes, respectively, with good to quantitative yields in the sense of a Sonogashira–Suzuki–Michael cyclization sequence. In the coupling of ortho-amidophenylboronates, interestingly, after ring closure a subsequent an acyl migration occurs to give 6-(2-(acyloxy)vinyl)phenanthridines.

Supporting Information



Publication History

Received: 18 October 2024

Accepted after revision: 29 November 2024

Accepted Manuscript online:
29 November 2024

Article published online:
02 January 2025

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