Vandyshev DY, Shikhaliev KS, Potapov AY, Krysin MY, Zubkov FI, Sapronova LV. A novel synthetic approach to hydroimidazo[1,5-
b]pyridazines by the recyclization of itaconimides and HPLC-HRMS monitoring of the reaction pathway.
Beilstein J Org Chem 2017;
13:2561-2568. [PMID:
29259665 PMCID:
PMC5727784 DOI:
10.3762/bjoc.13.252]
[Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 11/14/2017] [Indexed: 11/23/2022] Open
Abstract
The novel cascade two-stage reaction between itaconimides and 1,2-diamino-4-phenylimidazole proceeds regio- and chemoselectively to form tetrahydroimidazo[1,5-b]pyridazines and includes nucleophilic C-addition by the activated C=C double bond and subsequent intramolecular recyclization of the intermediate with the amino group involved.
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