An asymmetric assembly of naphthopyran was realized via the N-heterocyclic carbene (NHC)-catalyzed formal [3 + 3] annulation of bromoenal and β-tetralone. The key advantages of this protocol include ready availability of starting materials, mild reaction conditions, good yields and excellent enantioselectivities.
萘并
吡喃的不对称组装是通过N-杂环卡宾(NHC)催化的
溴烯醛和
β-四氢萘酮的正式[3 + 3]环化反应实现的。该方案的主要优点包括容易获得的起始原料,温和的反应条件,良好的收率和出色的对映选择性。