New C2 symmetric bis-aziridines efficient synthesis of (2S,5S)-1,6-Di(p-toluenesulfonyloxy)-2,5-hexanediol, and (2S,3E,5S)-1,6-Di(p-toluenesulfonyloxy)-2,5-hexenediol
摘要:
The regioselective tosylation and functionalization of (S,S)-1,2,5,6-hexanetetrol is reported. The reductive aminocyclization of conformationally flexible diazidodiols by PPh(3) leads to C-2 symmetric bis-aziridines and to substituted furans.
New C2 symmetric bis-aziridines efficient synthesis of (2S,5S)-1,6-Di(p-toluenesulfonyloxy)-2,5-hexanediol, and (2S,3E,5S)-1,6-Di(p-toluenesulfonyloxy)-2,5-hexenediol
The regioselective tosylation and functionalization of (S,S)-1,2,5,6-hexanetetrol is reported. The reductive aminocyclization of conformationally flexible diazidodiols by PPh(3) leads to C-2 symmetric bis-aziridines and to substituted furans.
New Access to Indolizidine and Pyrrolizidine Alkaloids from an Enantiopure Proline: Total Syntheses of (−)-Lentiginosine and (1<i>R</i>,2<i>R</i>,7a<i>R</i>)-Dihydroxypyrrolizidine
作者:Steven R. Angle、David Bensa、Dominique S. Belanger
DOI:10.1021/jo070462w
日期:2007.7.1
A new approach to the synthesis of indolizidine and pyrrolizidine skeletons is reported. (−)-Lentiginosine and (1R,2R,7aR)-dihydroxypyrrolizidine have both been synthesized in 13 steps from di-O-isopropylidene-d-mannitol. The common key intermediate is (−)-dihydroxyproline benzyl ester 10.