directed cyclization-dehydration cascade of α-aryloxy ketones and α-arylamino ketones was efficiently catalyzed by a cationic iridium-BINAP complex, which afforded various types of 4-substituted benzofurans and indoles in high yields with complete regioselectivity. The newly developed protocol also enabled the enantioselective preparation of chiral 4-acetyloxindole using a chiral iridium catalyst.
阳离子
铱-BINAP络合物可有效催化α-芳氧基酮和α-芳基
氨基酮的定向环化-脱
水级联反应,该络合物可高产率提供各种类型的4-取代的
苯并呋喃和
吲哚,具有完全的区域选择性。新开发的方案还允许使用手性
铱催化剂对映选择性制备手性4-乙酰基
吲哚。