Direct synthesis of quinazolinones by acceptorless dehydrogenative coupling of o-aminobenzamide and alcohols by heterogeneous Pt catalysts
作者:S. M. A. Hakim Siddiki、Kenichi Kon、Abeda Sultana Touchy、Ken-ichi Shimizu
DOI:10.1039/c4cy00092g
日期:——
metal nanoclusters (Pt/HBEA) effectively catalyze direct dehydrogenative synthesis of quinazolinones from o-aminobenzamide and alcohols under promoter-free conditions. This is the first heterogeneous catalytic system for this reaction, which has a turnover number (TON) more than 25 times higher than previous homogeneous catalysts as well as wide scope for aliphatic and aromatic alcohols.
catalyzed N-alkylation of benzamides and sulfonamides with alcohols via borrowing hydrogen catalysis is illustrated. Various primary alcohols, including benzyl, heteroaryl, and aliphatic alcohols, were alkylated in good to excellent yields. To shed light on the mechanistic details, several control studies and deuterium labeling experiments were performed. Mechanisticstudies underpin that the reaction is going
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。
Synthesis of quinazolinone scaffolds via a zinc(ii)-stabilized amidyl radical-promoted deaminative approach
作者:Subarna Manna、Sangita Sahoo、Arnab Rit
DOI:10.1039/d4cc01554a
日期:——
stable zinc compound, for the efficient coupling of o-amino amides/esters with nitriles to afford diverse quinazolinone scaffolds and their synthetic utility was showcased via post-modification to access therapeutically relevant compounds. Importantly, mechanistic probes established the reaction pathway that proceeds via aminyl radical.