Azepino [1,2,3-lm]-.beta.-carboline compounds and pharmaceutical
申请人:Tanabe Seiyaku Co., Ltd.
公开号:US04228168A1
公开(公告)日:1980-10-14
An azepino[1,2,3-lm]-.beta.-carboline compound of the formula: ##STR1## wherein R.sup.1 is hydrogen, cycloalkyl of 3 to 7 carbon atoms, phenyl, hydroxy, alkoxycarbonyl of 2 or 3 carbon atoms or alkanoyl of 2 or 3 carbon atoms, and A is single bond or straight or branched alkylene of one to 5 carbon atoms. Several methods of preparing the compound [I] are disclosed. The compound [I] and a pharmaceutical acceptable acid addition salt thereof have a potent anti-anoxic activity.
Metal‐Free Dearomatization: Direct Access to Spiroindol(en)ines in Batch and Continuous‐Flow
作者:Prabhat Ranjan、Gerardo M. Ojeda、Upendra K. Sharma、Erik V. Van der Eycken
DOI:10.1002/chem.201805945
日期:2019.2.18
A metal‐free, phosphine‐catalyzed intramolecular “umpolung Michael addition” on alkynes to form spiroindol(en)ines is reported. This nucleophilic catalysis enables the formation of a wide scope of five‐ and six‐membered spiroindol(en)ines in moderate to excellent yields in batch as well as under continuous‐flow conditions. Triphenylphosphine‐catalyzed nucleophilic activation of alkynes allows the exclusive
transannulation strategy using readily available tryptamines. Molecular oxygen and water are used as oxygen sources and provide direct access to the donaxaridine scaffold and its derivatives. This methodology is applied to the efficient synthesis of the natural products donaxaridine, chimonamidine, donaxanine, donaxarine, and aline in just one or two steps. The tryptamines, albeit with oxy-sensitive dialkyl N-H
Synthesis of tetrahydro-β-carbolines via isomerization of N-allyltryptamines: a metal-catalyzed variation on the Pictet–Spengler theme
作者:Erhad Ascic、Casper L. Hansen、Sebastian T. Le Quement、Thomas E. Nielsen
DOI:10.1039/c2cc17704h
日期:——
An efficient and broadly applicable alternative to the classical Pictet-Spengler synthesis of tetrahydro-beta-carbolines is presented. The method relies on metal-catalyzedisomerization of allylic amines to form reactive iminium intermediates which can be trapped by a tethered indole nucleophile.