Concise syntheses of racemic and enantiopure deoxydysibetaine
摘要:
Racemic deoxydysibetaine was efficiently obtained in few steps from methyl pyroglutamate. The 2S enantiomer was synthesized from (S)-pyroglutaminol as chiral starting material, through the key intermediate (S)-2-hydroxymethylglutamic acid recently prepared with complete stereoselectivity in our laboratory. (C) 2003 Elsevier Ltd. All rights reserved.
Concise syntheses of racemic and enantiopure deoxydysibetaine
作者:Bao Khanh Le Nguyen、Nicole Langlois
DOI:10.1016/s0040-4039(03)01505-3
日期:2003.8
Racemic deoxydysibetaine was efficiently obtained in few steps from methyl pyroglutamate. The 2S enantiomer was synthesized from (S)-pyroglutaminol as chiral starting material, through the key intermediate (S)-2-hydroxymethylglutamic acid recently prepared with complete stereoselectivity in our laboratory. (C) 2003 Elsevier Ltd. All rights reserved.
Diastereoselective Syntheses of Deoxydysibetaine, Dysibetaine, and Its 4-Epimer
作者:Nicole Langlois、Bao K. Le Nguyen
DOI:10.1021/jo040216+
日期:2004.10.1
(+/-)-Deoxydysibetaine 2 and 4-epi-dysibetaine 3 were prepared in a few steps from methyl pyroglutamate through a regioselective Mannich reaction at C-2. Natural (2S,4S)-dysibetaine 1, a sponge metabolite isolated from Dysidea herbacea, and (2S)-2 were synthesized from enantiopure (S)-pyroglutaminol with very high stereoselectivity. The key steps were an original formation of stereogenic quaternary center C-2 and the diastereoselective hydroxylation at C-4.