Quinazolinone-Directed C-H Activation: A Novel Strategy for the Acetoxylation-Methoxylation of the Arenes
摘要:
2-Aryl-4-quinazolinones undergo smooth acetoxylation in the presence of 5 mol% Pd(OAc)(2) and a stoichiometric amount of PhI(OAc)(2) via C-H activation to produce the corresponding acetoxy-substituted 4(3H)-quinazolinone derivatives in good yields with high regioselectivity.
说明了通过借氢催化有效的钌掺杂水滑石催化苯甲酰胺和磺酰胺与醇的 N-烷基化。各种伯醇,包括苄基醇、杂芳基醇和脂肪醇,都以良好的收率进行了烷基化。为了阐明机械细节,进行了几项对照研究和氘标记实验。机理研究表明,该反应是通过借氢途径而不是 S N 1 型机理进行的。该反应可以很容易地扩大规模,而不会对产率产生任何不利影响。该催化剂还能够直接由2-氨基苯甲酰胺和醇合成喹唑啉酮。成功的可回收性和高反应性突出了催化剂的实际适用性。
Metal-free oxidative cyclization of 2-amino-benzamides, 2-aminobenzenesulfonamide or 2-(aminomethyl)anilines with primary alcohols for the synthesis of quinazolinones and their analogues
A general metal-free oxidative cyclization process has been developed for the synthesis of quinazolinones, benzothiadiazines and quinazolines. By this protocol, a range of substituted 2-aminobenzamides, 2-aminobenzenesulfonamide and 2-(aminomethyl)anilines react with various alcohols, leading to the desired annulated products smoothly. This protocol features many advantages as broad substrate scope
A one step synthesis of functionlized N-acylanthranilamidevia Pd-catalyzed carboxamidation of o-halo substituted N-phenylamide consisting of isocyanideinsertion followed by oxidation of the imine intermediate has been achived successfully. Furthermore, at elevated temprature (160oC) the Pd-catalyzed tandem reaction afforded functionlized quinazolin-4-one in a single step without the isolation of
We have developed a KOH-promoted transition-metal-free synthesis of 2-substituted 4(3H)-quinazolinones from anthranilamides and benzyl alcohols or cinnamyl alcohol with air as oxidant. The protocol is simple, practical, and cost saving.