Seven new carbazole alkaloids, named pyraryafolines-B (1), -C (3), and -D (5), and euchrestines-A (7), -B (9), -C (10), and -D (11) were isolated from stem bark of Murraya euchrestifolia HAYATA (Rutaceae) collected in Taiwan and their sturctures were characterized by means of spectral methods. Pyrayafoline-B (1) was also synthesized.
Palladium(<scp>ii</scp>)-catalysed total synthesis of naturally occurring pyrano[3,2-<i>a</i>]carbazole and pyrano[2,3-<i>b</i>]carbazole alkaloids
作者:Ronny Hesse、Anne Jäger、Arndt W. Schmidt、Hans-Joachim Knölker
DOI:10.1039/c4ob00367e
日期:——
Seven naturallyoccurring pyranocarbazole alkaloids (pyrayafoline A–E, O-methylmurrayamine A and O-methylmahanine) have been obtained by totalsynthesis using a palladium(II)-catalysed oxidative cyclisation of a diarylamine to an orthogonally diprotected 2,7-dihydroxycarbazole as key step.
Synthesis of 1,1′- and 2,2′-Bicarbazole Alkaloids by Iron(III)-Catalyzed Oxidative Coupling of 2- and 1-Hydroxycarbazoles
作者:Christian Brütting、Raphael F. Fritsche、Sebastian K. Kutz、Carsten Börger、Arndt W. Schmidt、Olga Kataeva、Hans-Joachim Knölker
DOI:10.1002/chem.201704554
日期:2018.1.9
We describe the synthesis of 1,1′‐ and 2,2′‐bicarbazoles by oxidative homocoupling of 2‐ and 1‐hydroxycarbazoles. The oxidative coupling using catalytic amounts of F16PcFe can be applied to both groups of substrates. Although F16PcFe generally provides the best yields for the synthesis of 1,1′‐bicarbazoles, di‐tert‐butyl peroxide affords better results for the 2,2′‐bicarbazoles. In our study, we have