The hetero-Diels–Alder reaction is a powerful strategy for constructing six-membered heterocycles, yet natural enzymatic hetero-Diels–Alder reactions are limited to a single heteroatom. Now a bifunctional enzyme, Abx(−)F, is found to catalyse the dehydration and a dual-oxa Diels–Alder reaction to form the oxygen-bridged tricyclic acetal of (−)-anthrabenzoxocinones.
- Xiaoli Yan
- Xinying Jia
- Xudong Qu