通过使用可商购的简单K 2 CO 3 / I 2试剂组合,可以实现多种唑类的直接C2-H氧化和亚胺化。碘化唑加成物,产生通过所述原位生成N-杂环碳烯的,为C2-H氧化,亚胺化,和唑类的胺化的关键中间体。重要的是,这些反应在温和的条件下以高至优异的产率进行,可扩展至大量并显示出广泛的底物范围。有趣的是,这种直接的C2-H胺化方法使我们能够获得各种具有药理活性的N 6-烷基或N 6芳基取代的苯并咪唑并喹唑啉酮骨架通过分子内CH串联进行一锅反应。
Poly(4-vinylpyridine) catalyzed chemoselective O-TMS protection of alcohols and phenols and N-Boc protection of amines
作者:Farhad Shirini、Nader Ghaffari Khaligh
DOI:10.1007/s13738-011-0060-5
日期:2012.8
Poly(4-vinylpyridine) (PVP) acts as an efficient and reusable catalyst for the selective and efficient trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS) and N-tert-butoxycarbonylation of amines with (Boc)2O. All reactions were performed under mild conditions in good to high yields.
Thiamine hydrochloride as a recyclable organocatalyst for the efficient and chemoselective <i>N</i>-<i>tert</i>-butyloxycarbonylation of amines
作者:Ajit P. Ingale、Dnyaneshwar N. Garad、Dattatraya Ukale、Nitin M. Thorat、Sandeep V. Shinde
DOI:10.1080/00397911.2021.1994998
日期:2021.12.17
approach has been described for the chemoselective N-tert-butyloxycarbonylation of amines under solvent-free conditions at ambient temperature. The demonstrated approach has been applicable for the N-Boc protection of variety of aliphatic, aryl, heteroaryl amines. The chemoselective protection of amino group occurs in chiral amines and amino alcohol withoutracemization in high yield. Thiamin hydrochloride
Pyridopyrimidones, quinolines and fused N-heterocycles as bradykinin
申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US05994368A1
公开(公告)日:1999-11-30
This invention relates to a compound of the formula: ##STR1## wherein Z is a group of the formula: ##STR2## in which X.sup.1 is N or C--R.sup.1, X.sup.2 is N or C--R.sup.9, X.sup.3 is N or C--R.sup.2, R.sup.1 is lower alkyl, R.sup.2 is hydrogen, lower alkyl, etc., R.sup.9 is hydrogen or lower alkyl, R.sup.3 is halogen, etc., R.sup.4 is halogen, etc., R.sup.5 is a group of the formula: ##STR3## A is lower alkylene, and Y is O, etc., and pharmaceutically acceptable salts thereof, to processes for preparation thereof, to a pharmaceutical composition comprising the same, and to methods to using the same therapeutically in the prevention and/or the treatment of bradykinin or its analogues mediated diseases in human being or animals.
这项发明涉及以下化合物的公式:##STR1## 其中 Z 是以下公式的一个基团:##STR2## 其中 X^1 是 N 或 C--R^1,X^2 是 N 或 C--R^9,X^3 是 N 或 C--R^2,R^1 是较低的烷基,R^2 是氢,较低的烷基等,R^9 是氢或较低的烷基,R^3 是卤素等,R^4 是卤素等,R^5 是以下公式的一个基团:##STR3## A 是较低的烷基,Y 是 O 等,以及其药学上可接受的盐,制备方法,包含相同化合物的药物组合物,以及在人类或动物中在预防和/或治疗激肽酶或其类似物介导的疾病中治疗使用相同的方法。
Preparation, characterization and application of succinimidinium hydrogensulfate ([H-Suc]HSO<sub>4</sub>) as an efficient ionic liquid catalyst for the N-Boc protection of amines
Succinimidinium hydrogensulfate ([H-Suc]HSO4), which is prepared from the reaction of succinimide and sulfuric acid, showed excellent catalytic activity for theN-Boc protection of various amines under solvent free conditions.
A new protocol of protection of poorly reactive aryl amines and functionalized amines with Boc2O in the presence of Zn(ClO4)2·6H2O as the catalyst is reported. The catalytic action of Zn(ClO4)2·6H2O is specific for the activation of the pyrocarbonates, thus acid sensitive functionalities and stereochemical configurations of the starting materials remain unaltered in the protection process.