Almond-Thynne J, White AJP, Polyzos A, Rzepa HS, Parsons PJ, Barrett AGM. Synthesis and Reactions of Benzannulated Spiroaminals: Tetrahydrospirobiquinolines.
ACS OMEGA 2017;
2:3241-3249. [PMID:
30023690 PMCID:
PMC6044889 DOI:
10.1021/acsomega.7b00482]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2017] [Accepted: 05/19/2017] [Indexed: 06/08/2023]
Abstract
An efficient two-step synthesis of symmetrical and unsymmetrical tetrahydrospirobiquinolines from o-azidobenzaldehydes is reported. A novel series of tetrahydrospirobiquinolines was prepared by sequential double-aldol condensation with acetone, cyclopentanone, and cyclohexanone to form the corresponding o,o'-diazido-dibenzylidene-acetone, -cyclopentanone, and -cyclohexanone derivatives, respectively, and hydrogenation-spirocyclization. The spirodiamines were further derivatized by electrophilic aromatic bromination, Suzuki coupling, and N-alkylation, all of which proceeded with preservation of the spirocyclic core.
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