Copper- versus palladium-catalyzed aromatization of 2-(methoxycarbonyl) tetralones: synthesis of methyl 1-hydroxy-2-naphthoates
作者:José F. Cívicos、Carlos M.R. Ribeiro、Paulo R.R. Costa、Carmen Nájera
DOI:10.1016/j.tet.2016.01.057
日期:2016.4
at the β-position by an ester group is reported using either CuI or Pd2(dba)3. In the case of using CuI (10 mol %) as catalyst and Cs2CO3 as base in dioxane, 2-(methoxycarbonyl)-α-tetralones are smoothly converted into the corresponding methyl 1-hydroxy-2-naphthoates at 70 °C under air. Alternatively, Pd2(dba)3 (1.25 mol %) can also be used as catalyst in the presence of K3PO4 as base in toluene also
使用CuI或Pd 2(dba)3报道了在β位被酯基取代的α-四氢萘酮的芳构化。在二恶烷中使用CuI(10 mol%)作为催化剂和Cs 2 CO 3作为碱的情况下,在70°C下将2-(甲氧基羰基)-α-四氢萘酮平稳地转化为相应的1-羟基-2-萘甲酸甲酯在空气中。或者,在K 3 PO 4的存在下,也可以将Pd 2(dba)3(1.25 mol%)用作催化剂。也是在70°C氩气下在甲苯中作为碱。这些是将这些类型的α-四氢萘酮进行芳构化的最直接方法。由于更高的效率,经济和实用的原因,CuI是选择的催化剂。
Access to Naphthoic Acid Derivatives through an Oxabenzonorbornadiene Rearrangement
作者:Daniel Lücke、Alexander S. Campbell、Martin Petzold、Richmond Sarpong
DOI:10.1021/acs.orglett.3c02823
日期:2023.10.13
Herein, the synthesis of 1-hydroxy-2-naphthoic acid esters through an unexpected Lewis-acid-mediated 1,2-acyl shift of oxabenzonorbornadienes is reported. Using this methodology, novel substitution patterns for 1-hydroxy-2-naphtoic acid esters can be obtained. A mechanistic proposal and rationale for this transformation, the products of which had been previously incorrectly characterized, is given
Regioselective Oxidative Chlorination of Arenols Using NaCl and Oxone
作者:Muhammet Uyanik、Naoto Sahara、Kazuaki Ishihara
DOI:10.1002/ejoc.201801063
日期:2019.1.10
A practical and efficient chlorination of naphthols and phenols was developed using transient chlorinating species generated in situ from inexpensive sodium chloride and Oxone as a Cl source and oxidant, respectively, under mild conditions.