作者:Aaron Aponick、Amber L. Dietz、William H. Pearson
DOI:10.1002/ejoc.200800482
日期:2008.9
The preparation of 2-(3-pyrrolin-1-yl)-1,4-naphthoquinones and a study of their use as photoactivated alkylating agents is reported. The title compounds were easily synthesized by conjugate addition of the corresponding 3-pyrrolines to various naphthoquinones. Upon exposure to ambient room light, the compounds undergo an internal redox reaction to form 2-(pyrrol-1-yl)-1,4-hydroquinones, which are activated
A novel approach to azasugars from vinyl glycine methyl ester via olefin metathesis
作者:Christoph M. Huwe、Siegfried Blechert
DOI:10.1016/0040-4039(94)02308-x
日期:1995.3
A novel strategy for the synthesis of azasugars from vinylglycine methyl ester was designed, using an olefin metathesis as a key step. As a first test of this strategy, rac-trans-2-hydroxymethyl-3-hydroxypyrrolidine, which was isolated as the (2R,3S)-isomer from the legume Castanospermum australe, was synthesized.
A New Route to Diverse 1-Azasugars from <i>N</i>-Boc-5-hydroxy-3-piperidene as a Common Building Block
作者:Hidekazu Ouchi、Yukiko Mihara、Hiroki Takahata
DOI:10.1021/jo050519j
日期:2005.6.1
for the synthesis of a variety of 1-azasugars with a nitrogen atom at the anomeric position is described. The readily available chiral N-Boc-5-hydroxy-3-piperidene 3 is transformed to isofagomine (2), homoisofagomine (13), and 5‘-deoxyisofagomine (14) via stereoselective epoxidation and regioselective ring-cleavage in a highlystereocontrolled manner. In addition, the synthesis of all four stereoisomers
A New Preparation of HomochiralN-Protected 5-Hydroxy-3- piperidenes, Promising Chiral Building Blocks, by Palladium- Catalyzed Deracemization of Their Alkyl Carbonates
The palladium-catalyzed deracemization of N-protected alkylcarbonates of 5-hydroxy-3-piperidenes by use of chiral phosphine ligands is described. A Trost ligand such as (R)-BPA was found to be a suitable chiral ligand for the deracemization, providing N-protected 5-hydroxy-3-piperidenes in good yields with good to high enantioselectivities. A plausible mechanism for the reaction is proposed.