N‐Propargyl‐ and N‐homoallenyl‐2‐bromo‐β‐tryptamines undergo gold(I)‐catalyzed dearomatizing cyclizations to afford 2‐bromospiroindolenines that are in situ hydrolyzed to furnish spirooxindoles in a one‐pot process. Tryptophane derivatives (R2=CO2Et) led upon cyclization to chiral spirooxindoles in excellent diastereoselectivities.
N-炔丙基和N-高聚烯丙基-2-
溴-β-
色胺经
金(I)催化的脱芳香环化反应生成2-
溴螺亚
吲哚,将其原位
水解以单锅法提供螺
硫醇。色
氨酸衍
生物(R 2 = CO 2 Et)在环化作用下以极好的非对映选择性而生成手性螺
硫醇。