Switchable Oxidative Reactions of <i>N</i>-allyl-2-Aminophenols: Palladium-Catalyzed Alkoxyacyloxylation vs an Intramolecular Diels–Alder Reaction
作者:Sabrina Giofrè、Manfred Keller、Leonardo Lo Presti、Egle M. Beccalli、Letizia Molteni
DOI:10.1021/acs.orglett.1c02539
日期:2021.10.15
The Pd(II)-catalyzed reaction of N-allyl-2-aminophenols in the presence of PhI(OCOR)2 as the oxidant resulted in an alkoxyacyloxylation process, with the formation of functionalized dihydro-1,4-benzoxazines. The reaction performed in the absence of palladium catalyst switched to an intramolecular Diels–Alder reaction (IMDA) pathway, which was the result of an oxidative dearomatization of the 2-aminophenol
Palladium-Catalyzed Asymmetric Aminohydroxylation of 1,3-Dienes
作者:Hong-Cheng Shen、Yu-Feng Wu、Ying Zhang、Lian-Feng Fan、Zhi-Yong Han、Liu-Zhu Gong
DOI:10.1002/anie.201712350
日期:2018.2.23
A PdII‐catalyzed asymmetricaminohydroxylation of 1,3‐dienes with N‐tosyl‐2‐aminophenols was developed by making use of a chiral pyridinebis(oxazoline) ligand. The highly regioselective reaction provides direct and efficient access to chiral 3,4‐dihydro‐2H‐1,4‐benzoxazines in high yield and enantioselectivity (up to 96:4 e.r.). The reaction employs readily available N‐tosyl‐2‐aminophenols as a unique
利用手性吡啶双(恶唑啉)配体开发了Pd II催化的1,3-二烯与N-甲苯磺酰基-2-氨基苯酚的不对称氨基羟基化反应。高度区域选择性反应可直接高效地获得手性3,4-二氢-2 H -1,4-苯并恶嗪,且产率高且对映选择性高(高达96:4 er)。该反应采用现成的N-甲苯磺酰基-2-氨基苯酚作为独特的氨基羟基化试剂,是已知不对称氨基羟基化方法的补充。