The first sulfur ylides involved formal [5+1]‐annulation reaction was developed between prop‐2‐ynylsulfonium salts and 2‐(1H‐indol‐2‐yl)phenols. Prop‐2‐ynylsulfonium salt participates in the reaction with its β‐carbon atom and acts as a novel C₁ synthon. Various indole‐fused 4H‐benzo[e][1,3]oxazines bearing a thioether moiety were constructed in good to high yields under mild conditions.

中文翻译：

---

硫内鎓盐和2-（1H-吲哚-2-基）苯酚的正式[5 + 1]年化反应：获得吲哚融合的4H-苯并[e] [1,3]恶嗪

在丙-2-炔基ulf盐和2-（1 H-吲哚-2-基）酚之间开发了第一个正式的[5 + 1]-环化反应的硫酰化物。丙-2-炔基salt盐与其β-碳原子参与反应，并充当新型C ₁合成子。在温和条件下，以良好或高收率构建了各种带有硫醚部分的吲哚稠合的4 H-苯并[ e ] [1,3]恶嗪。