Scheme 1.

Synthesis of ajoene 3 as described by Block et al. in 1984. (a) Formation of allicin 2 from alliin 1 by the action of alliinase. (b) Formation of E/Z‐ajoene 3 from 2 by thermal rearrangement in aqueous acetone. (c) Synthesis of ajoene analogues 4 by Hunter et al. (d) Synthesis of ajoene 3 by Silva et al.10