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-Rhamnulose-1-phosphate Aldolase from <i>Thermotoga maritima</i>
in Organic Synthesis: One-Pot Multistep Reactions for the Preparation of Imino- and Nitrocyclitols
focusing on (i) the reaction stereocontrol, (ii) the possibility of combining it with other mesophilic enzymes in multienzyme systems and (iii) itsapplication to the synthesis of imino‐ and nitrocyclitols. In our study, the diastereoselectivity of Rhu1PATm was similar to the one reported for Rhu1PA from Escherichia coli (Rhu1PAEc). However, we observed significant differences for some aldehyde acceptors
Polyhydroxylated pyrrolizidine alkaloids from transannular iodoaminations: application to the asymmetric syntheses of (−)-hyacinthacine A1, (−)-7a-epi-hyacinthacine A1, (−)-hyacinthacine A2, and (−)-1-epi-alexine
作者:E. Anne Brock、Stephen G. Davies、James A. Lee、Paul M. Roberts、James E. Thomson
DOI:10.1039/c3ob40205c
日期:——
N-substituent) were readily prepared via conjugate addition of lithium (R)-N-but-3-enyl-N-(α-methyl-p-methoxybenzyl)amide to either tert-butyl (4S,5R,E)-4,5-dihydroxy-4,5-O-isopropylidene-2,7-dienoate (derivedfrom D-ribose) or tert-butyl (S,S,E)-4,5-dihydroxy-4,5-O-isopropylidene-2,7-dienoate (derivedfrom L-tartaric acid) coupled with in situ enolate oxidation with (−)-camphorsulfonyloxaziridine, followed
Nitro-polyols via Pyridine Promoted C═C Cleavage of 2-Nitroglycals. Application to the Synthesis of (−)-Hyacinthacine A1
作者:Shengbiao Tang、De-Cai Xiong、Shende Jiang、Xin-Shan Ye
DOI:10.1021/acs.orglett.5b03607
日期:2016.2.5
A mild and convenient transformation for the synthesis of nitro-polyols is described. The nitro-polyol derivatives were prepared either from 2-nitroglycals via a pyridine-promoted scission of the carbon–carbon double bond or from glycals via a sequential nitration–scission procedure. The generated nitro-polyols could undergo a stereoselective Michael addition reaction. The utility of the addition products