Brachet E, Marzo L, Selkti M, König B, Belmont P. Visible light amination/Smiles cascade: access to phthalazine derivatives.
Chem Sci 2016;
7:5002-5006. [PMID:
30155150 PMCID:
PMC6018559 DOI:
10.1039/c6sc01095d]
[Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/06/2016] [Indexed: 01/02/2023] Open
Abstract
We report the synthesis of various phthalazines via a new cascade reaction, initiated by visible light photocatalysis, involving a radical hydroamination reaction followed by a radical Smiles rearrangement. Phthalazine derivatives are obtained in high yields and from a broad scope readily accessible ortho-alkynylsulfonohydrazone precursors. The mild photoredox conditions ensure an excellent functional group tolerance. Application of this strategy to a one-pot protocol starting from the corresponding carbonyl compounds, and subsequent functionalization allow the rapid synthesis of structurally diverse structures.
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