Catalytic Redox Chain Ring Opening of Lactones with Quinones To Synthesize Quinone-Containing Carboxylic Acids
作者:Xiao-Long Xu、Zhi Li
DOI:10.1021/acs.orglett.9b01672
日期:2019.7.5
Catalytic ringopening of five- to eight-membered lactones with quinones is achieved through a redox chain mechanism. With low loading of a simple metal triflate Lewis acid catalyst and a chain initiator, C–H bonds of many quinones were efficiently functionalized with carboxylic acid-containing side chains. This method also features 100% atom economy and wide substrate scope. A novel route to the anti-asthma
Compounds of formula VII are described:
1
wherein A represents phenyl or naphthyl and
Ar
1
and Ar
2
independently represent a saturated or aromatic carbocyclic group. The compounds may be prepared by reducing the nitrile functions of a compound of formula I:
2
描述了式 VII 的化合物:
1
其中 A 代表苯基或萘基,且
Ar
1
和 Ar
2
分别代表饱和或芳香碳环基团。这些化合物可通过还原式 I 化合物的腈基官能团来制备:
2
Siteselective and Enantiocomplementary C(sp3)–H Oxyfunctionalization for Synthesis of α-Hydroxy Acids
Oxyfunctionalization of abundant carboxylic acids represents a direct approach to synthesizing α-hydroxyacids, which are valuable intermediates of various active pharmaceutical ingredients. Although ideal, the transformation is yet to be accomplished. Herein, enantiocomplementary C(sp3)–H oxyfunctionalization for the synthesis of α-hydroxyacids was realized by a cooperative strategy of substrate