我们展示了通过整体三步交叉偶联/环化/ N-脱保护/ N-烷基化序列制备多种N-取代的 3,4-二氢异喹啉-1(2 H )-one 化合物的通用方法。在第一步中,2-溴苯甲酸乙酯和 2-溴-1-羧乙基杂环与市售钾(2-((叔丁氧羰基)氨基)乙基)三氟硼酸盐交叉偶联,生成(杂)芳基取代的 3- [( N -Boc-2-羧乙基)苯基]乙胺。在随后的两阶段过程中,这些(杂)芳基乙胺经历碱基介导的环闭合,然后是N -脱保护和N-烷基化生成N-取代的 3,4-二氢异喹啉-1(2 H )-ones 和杂芳基稠合的N-苄基 3,4-二氢吡啶-2(1 H )-ones。进行了机械工作以阐明后两阶段过程的转换顺序。该方法还扩展到生产N-苄基异吲哚啉-1-酮和N-苄基 2,3,4,5-四氢-1 H-苯并[ c ]氮卓-1-酮。
Covalent Organic Frameworks toward Diverse Photocatalytic Aerobic Oxidations
作者:Shuyang Liu、Miao Tian、Xiubin Bu、Hua Tian、Xiaobo Yang
DOI:10.1002/chem.202100398
日期:2021.5.17
two‐dimensional covalentorganicframeworks (2D‐COFs) have become promising heterogenous photocatalysts in visible‐light‐drivenorganic transformations. Herein, a visible‐light‐driven selective aerobic oxidation of various small organic molecules by using 2D‐COFs as the photocatalyst was developed. In this protocol, due to the remarkable photocatalytic capability of hydrazone‐based 2D‐COF‐1 on molecular
A series of [1,2,4]triazolo[4,3-alpha][1,4]benzodiazepines bearing an ethynyl functionality at the 8-position and the isosteric thieno[3,2-f][1,2,4]triazolo[4,3-alpha][1,4]diazepines were prepared and evaluated as antagonists of platelet activating factor. The effects of substitution were explored in in vitro and in vivo test systems designed to measured PAF-antagonistic activity. Results are discussed and compared with previously published data. Many of the compounds had activity superior to WEB 2086, compound 1. In general, the thieno analogues exhibited better oral activity than the corresponding benzodiazepines. The duration of activity upon oral administration was modulated by the substitution on the acetylenic side chain. Compounds 71 and 81 were selected for further pharmacological evaluation as a result of their good oral potency and exceptionally long duration of action.
WALSER, ARMIN;FLYNN, THOMAS;MASON, CARL;CROWLEY, HERMAN;MARESCA, CATHERIN+, J. MED. CHEM., 34,(1991) N, C. 1209-1221