开发了由2,4,5,6-四(9 H-咔唑-9-基)间苯二甲腈(4CzIPN)催化的苄基保护的均丙醇和胺衍生物的加氢三氟甲基化。该反应递送δ-氟甲基化的游离醇和胺,并在温和的辐射条件下原位去保护苄基保护基。已发现4CzIPN是一种有效的无金属光氧化还原催化剂,可通过氧化猝灭活化CF 3 SO 2 Cl,Togni试剂和2-溴-2,2-二氟乙酸酯,以及通过CF 3 SO 2 Na活化几种类型的氟甲基化试剂。还原淬灭,以使简单的烯烃和迈克尔受体直接进行氢三氟甲基化。
1,3-Dipolar cycloadditions of aryl nitrile oxides 2d-f to various racemic 3-hydroxy- and 3-acyloxy-but-1-enes 1a-c proceeded with complete regioselectivity to afford the corresponding 3,5-disubstituted isoxazolines in good yields. The steric and/or electroniceffect of an acyloxy group at the allylic position on the stereoselectivity has been studied.