Enantioselective Synthesis of cis- and trans-2-Methyl-6-nonylpiperidines: Alkaloids Solenopsin and Isosolenopsin
摘要:
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.
Enantioselective Synthesis of cis- and trans-2-Methyl-6-nonylpiperidines: Alkaloids Solenopsin and Isosolenopsin
摘要:
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.
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.