Raynbird MY, Silva F, Smallman H, Khokhar SS, Neef D, Evans GJS, Wirth T. Short Total Synthesis of Ajoene, (E,Z)-4,5,9-Trithiadodeca-1,6,11-triene 9-oxide, in Batch and (E,Z)-4,5,9-Trithiadodeca-1,7,11-triene in Continuous Flow.
Chemistry 2020;
26:8363-8367. [PMID:
32364668 PMCID:
PMC7384054 DOI:
10.1002/chem.202001598]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Indexed: 11/21/2022]
Abstract
A short total synthesis of ajoene, (E,Z)-4,5,9-trithiadodeca-1,6,11-triene 9-oxide, has been achieved over six steps. In addition, a continuous flow synthesis under mild reaction conditions to (E,Z)-4,5,9-trithiadodeca-1,7,11-triene is described starting from simple and easily accessible starting materials. Over four steps including propargylation, radical addition of thioacetate, deprotection, and disulfide formation/ allylation, the target product can be obtained at a rate of 0.26 g h-1 in an overall yield of 12 %.
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