Biomimetic Formation of Macrocyclic Spermine Alkaloids
摘要:
Dihydroxyverbacine (10), a precursor for oxidative phenol coupling. was obtained via (+/-)-buchnerine (14). whose synthesis is described. The oxidizing system hemin (ferriprotoporphyrin IX chloride)/H2O2 promoted intramolecular coupling of 10 to give the alkaloids aphelandrine (1). orantine (2), and chaenorpine (7). The alkaloids were identified by on-line coupled HPLC and atmospheric-pressure chemical-ionization (APCI) mass spectrometry.
Metal-Templated Macrolactamization of Triamino and Tetramino Esters. Facile Synthesis of Macrocyclic Spermidine and Spermine Alkaloids, (<i>S</i>)-(+)-Dihydroperiphylline, (±)-Buchnerine, (±)-Verbacine, (±)-Verbaskine, and (±)-Verbascenine
The totalsynthesis of spermidine and spermine alkaloids, (S)-(+)-dihydroperiphylline (1), (±)-buchnerine (2), (±)-verbacine (3), (±)-verbaskine (4), and (±)-verbascenine (5), is described. The construction of macrocyclic lactams has been efficiently accomplished by the metal-templated cyclization of triamino esters and tetraamino esters. It was also found that the antimony(III) ethoxide is useful
Natural preservatives and antimicrobial agents, including compositions thereof
申请人:Unigen, Inc.
公开号:US10780173B2
公开(公告)日:2020-09-22
Compositions are disclosed herein that comprise a mixture of at least one Albizia extract and a Magnolia extract. In some embodiments, the composition comprises a mixture of at least one Albizia extract enriched for one or more macrocyclic alkaloids and at least one Magnolia extract enrich for one or more lignans.
Antimony-Templated Macrolactamization of Tetraamino Esters. Facile Synthesis of Macrocyclic Spermine Alkaloids, (±)-Buchnerine, (±)-Verbacine, (±)-Verbaskine, and (±)-Verbascenine
NATURAL PRESERVATIVES AND ANTIMICROBIAL AGENTS, INCLUDING COMPOSITIONS THEREOF
申请人:Unigen, Inc.
公开号:EP3373946A1
公开(公告)日:2018-09-19
Natural Preservatives and Antimicrobial Agents, Including Compositions Thereof
申请人:Unigen, Inc.
公开号:US20170173162A1
公开(公告)日:2017-06-22
Compositions are disclosed herein that comprise a mixture of at least one
Albizia
extract and a
Magnolia
extract. In some embodiments, the composition comprises a mixture of at least one
Albizia
extract enriched for one or more macrocyclic alkaloids and at least one
Magnolia
extract enrich for one or more lignans.