Stereoselective α-Aminoallylation of Aldehydes with Chiral<i>tert</i>-Butanesulfinamides and Allyl Bromides<sup>†</sup>
作者:José C. González-Gómez、Mohamed Medjahdi、Francisco Foubelo、Miguel Yus
DOI:10.1021/jo101379u
日期:2010.9.17
combination of an aldehyde, an allylic bromide, and tert-butanesulfinamide in the presence of indium metal and titanium tetraethoxide allows straightforward access to homoallylamine derivatives in high yields and stereoselectivities. Moreover, the synthetic utility of the enantioenriched homoallylamine derived from n-decanal was illustrated in a concise synthesis of (+)-isosolenopsin. In this context, similar
Cross-Metathesis of Chiral <i>N</i>-<i>tert</i>-Butylsulfinyl
Homoallylamines: Application to the Enantioselective Synthesis of
Naturally Occurring 2,6-<i>cis</i>-Disubstituted Piperidines
The synthesis of piperidine alkaloids (+)-dihydropinidine (1), (+)-isosolenopsin (2a), (+)-isosolenopsin A (2b), and (2R,6R)-6-methylpipecolic acid (3a) hydrochlorides, based on cross-metathesis of chiral N-tert-butylsulfinyl homoallylamines with methyl vinyl ketone, is presented.
Concise Chemoenzymatic Three-Step Total Synthesis of Isosolenopsin through Medium Engineering
作者:Robert C. Simon、Christine S. Fuchs、Horst Lechner、Ferdinand Zepeck、Wolfgang Kroutil
DOI:10.1002/ejoc.201300157
日期:2013.6
A short and efficient totalsynthesis of the alkaloid isosolenopsin and its enantiomer has been achieved. In the key step, a omega-transaminase catalyzed the regioselective mono-amination of the diketone pentadecane-2,6-dione which was obtained in a single step via Grignard reaction. Initial low conversions in the biotransformation could be overcome by optimisation of the reaction conditions employing
Enantioselective Synthesis of cis- and trans-2-Methyl-6-nonylpiperidines: Alkaloids Solenopsin and Isosolenopsin
作者:Miguel Yus、José Carlos González-Gómez、Mohamed Medjahdi、Francisco Foubelo
DOI:10.3987/com-12-s(n)27
日期:——
The cross-metathesis of the enantioenriched homoallylic amine 8 (readily accessible by alpha-aminoallylation of decanal) with methyl vinyl ketone using the Hoveyda-Blechert catalyst 10 in presence of 10 mol% of Ti(O-i-Pr)(4) led exclusively to the (E)-enone 11, which by stereoselective reductive amination affords (+)-isosolenopsin (3a) and (+)-solenopsin (4a) with excellent selectivities.