Structure Characterization, Biomimetic Total Synthesis, and Optical Purity of Two New Pyrrolidine Alkaloids, Pandamarilactonine-A and -B, Isolated from Pandanus amaryllifolius Roxb.
摘要:
Two new alkaloids, both possessing a pyrrolidinyl alpha,beta-unsaturated gamma-lactone residue and a gamma-alkylidene alpha,beta-unsaturated gamma-lactone residue, were isolated from a tropical medicinal plant, Pandanus amaryllifolius Roxb. Their structures were deduced by spectroscopic analysis including the new NMR technique PFG J-HMBC 2D spectroscopy and then confirmed by biomimetic total synthesis. It was found that one diastereoisomer, pandamarilactonine-A (1), comprised a mixture enriched with (+)-enantiomer, while another diastereomeric isomer, pandamarilactonine-B (2), occurred as a racemate.
Structure Characterization, Biomimetic Total Synthesis, and Optical Purity of Two New Pyrrolidine Alkaloids, Pandamarilactonine-A and -B, Isolated from Pandanus amaryllifolius Roxb.
摘要:
Two new alkaloids, both possessing a pyrrolidinyl alpha,beta-unsaturated gamma-lactone residue and a gamma-alkylidene alpha,beta-unsaturated gamma-lactone residue, were isolated from a tropical medicinal plant, Pandanus amaryllifolius Roxb. Their structures were deduced by spectroscopic analysis including the new NMR technique PFG J-HMBC 2D spectroscopy and then confirmed by biomimetic total synthesis. It was found that one diastereoisomer, pandamarilactonine-A (1), comprised a mixture enriched with (+)-enantiomer, while another diastereomeric isomer, pandamarilactonine-B (2), occurred as a racemate.
The stereoselective synthesis of 6Z-pandanamine by base-promoted 5-exo-dig-selective cyclization reaction of bis-2-en-4-ynoic acid derivative as a key step is described
Synthesis of Norpandamarilactonines, Pandamarilactonines, and Pandanamine
作者:Narshinha Argade、Sanjib Gogoi
DOI:10.1055/s-2008-1072534
日期:2008.5
A facile route to naturally occurring (±)-norpandamarilactonines A and B, (±)-pandamarilactonines A-D, and pandanamine has been described from 3-methylfuran-2(5H)-one, with a reductive intramolecular aza-Michael-type addition as the key step.
Structure Characterization, Biomimetic Total Synthesis, and Optical Purity of Two New Pyrrolidine Alkaloids, Pandamarilactonine-A and -B, Isolated from <i>Pandanus amaryllifolius</i> Roxb.
作者:Hiromitsu Takayama、Tomotake Ichikawa、Toshiyuki Kuwajima、Mariko Kitajima、Hiroko Seki、Norio Aimi、Maribel G. Nonato
DOI:10.1021/ja0009929
日期:2000.9.1
Two new alkaloids, both possessing a pyrrolidinyl alpha,beta-unsaturated gamma-lactone residue and a gamma-alkylidene alpha,beta-unsaturated gamma-lactone residue, were isolated from a tropical medicinal plant, Pandanus amaryllifolius Roxb. Their structures were deduced by spectroscopic analysis including the new NMR technique PFG J-HMBC 2D spectroscopy and then confirmed by biomimetic total synthesis. It was found that one diastereoisomer, pandamarilactonine-A (1), comprised a mixture enriched with (+)-enantiomer, while another diastereomeric isomer, pandamarilactonine-B (2), occurred as a racemate.