Dilactams. Synthesis of nonsymmetrical dibenzodiazocinediones 1
摘要:
We report the first examples of nonsymmetrical dibenzodiazoeinediones, mono-, di-, tri- and tetra-substituted in the aromatic rings including a benzo pyridino diazocine, by a new short method without the requirement of protection. The procedure involves conversion of an anthranilic acid to its sulfinamide lactone followed by direct heating with a different N-alkylanthranilic acid. (C) 2003 Elsevier Ltd. All rights reserved.
<i>N</i>-Carboxyanhydrides directly from amino acids and carbon dioxide and their tandem reactions to therapeutic alkaloids
作者:Thi V. Tran、Yi Shen、Hieu D. Nguyen、Shijie Deng、Hootan Roshandel、Mason M. Cooper、Jose R. Watson、Jeffery A. Byers、Paula L. Diaconescu、Loi H. Do
DOI:10.1039/d2gc03507c
日期:——
versatile N-carboxyanhydrides (NCAs) directly from amino acids and CO2 using n-propylphosphonic anhydride. Most of the NCAs were isolated with >95% purity after simple workup, avoiding the need for tedious purification procedures typically required using conventional methods. Because the reagents and conditions employed are mild, tandem reactions with moisture-sensitive NCAs were carried out to transform