Direct Synthesis of Esters and Amides from Unprotected Hydroxyaromatic and -aliphatic Carboxylic Acids
作者:Alan R. Katritzky、Sanjay K. Singh、Chunming Cai、Sergey Bobrov
DOI:10.1021/jo052293q
日期:2006.4.1
activation of hydroxy-substituted carboxylic acids using benzotriazole chemistry without prior protection of the hydroxy substituents is presented. The N-acylbenzotriazole intermediates 2a−g, 6a−d, and 9a−c have been used for high-yielding synthesis of both aliphatic (3a−l) and aromatic (7a−h, 10a−f) hydroxy carboxamides. High yields of aromatic hydroxy esters 12a−h and 13a−i were obtained using either
Dearomatizative azidation and peroxidation of [small beta]-naphthols have been explored using copper bromide as a catalyst. These reactions lead to highly valuable naphthalenone derivatives such as quaternary azide derivatives and quaternary...
Direct halogenative dearomatization of 2-naphthols by NXS (X = Cl, Br) in water
作者:Zhenbei Zhang、Qiangsheng Sun、Daqian Xu、Chungu Xia、Wei Sun
DOI:10.1039/c6gc01673a
日期:——
A direct halogenative dearomatization of substituted 2-naphthols was achieved by NXS (X = Cl, Br) in environmentally friendly water at room temperature.
Organocatalytic asymmetric chlorinative dearomatization of naphthols
作者:Qin Yin、Shou-Guo Wang、Xiao-Wei Liang、De-Wei Gao、Jun Zheng、Shu-Li You
DOI:10.1039/c5sc00494b
日期:——
An organocatalyticasymmetric chlorinative dearomatization of naphthols was realized for the first time, providing chiralnaphthalenones with a Cl-containing all-substituted stereocenter in excellent yields and enantioselectivity (up to 97% yield and 96% ee). The reaction features mild reaction conditions, good tolerance of diverse functional groups and simple reaction operation.
A fast and highly enantioselective brominativedearomatization of naphtholscatalyzed by diphenylamine‐linked bis(oxazoline)‐Cu(OTf)2 complexes has been developed. The corresponding products of chiral naphthalenones bearing a Br‐containing tetrasubstituted stereogenic center could be obtained with good to excellent enantioselectivities (up to 95% ee) in excellent yields (up to 97% yield) within short