Synthesis of 2-Hydroxymethylglutamic acid and congeners thereof
申请人:——
公开号:US20020147362A1
公开(公告)日:2002-10-10
One aspect of the present invention relates to 2-hydroxymethylglutamic acid and congeners thereof. A second aspect of the invention relates to a method of synthesizing 2-hydroxymethylglutamic acid and congeners thereof.
Enantioselective Total Synthesis of (1<i>R</i>,3<i>S</i>,4<i>R</i>,5<i>R</i>)-1-Amino-4,5-dihydroxycyclopentane-1,3-dicarboxylic Acid. A Full-Aldol Access to Carbaketose Derivatives
achieved in 15 linear steps from silyloxypyrrole 3, utilizing l-glyceraldehyde 4 as the source of chirality. The key steps in the synthesis are three sequential aldol-based carbon−carbonbond-formingreactions: two crossed vinylogousaldol additions (2 + 3 → 8 and 4 + 5 → 10 + 11) and one intramolecular silylative aldolization (6 → 7). En passant, the short syntheses of (2S)-2-hydroxymethylglutamic acid
Highly Enantioselective Synthesis of (2<i>S</i>)-α-(Hydroxymethyl)-glutamic Acid by the Catalytic Michael Addition of 2-Naphthalen-1-yl-2-oxazoline-4-carboxylic Acid <i>tert</i><i>-</i>Butyl Ester
[reaction: see text]. Highly enantioselective synthesis of a potent metabotropic receptor ligand, (2S)-alpha-(hydroxymethyl)-glutamic acid (2, HMG) was accomplished by the catalytic Michael addition of 2-naphthalen-1-yl-2-oxazoline-4-carboxylic acid tert-butyl ester (3b), using the phosphazene base, BEMP, in CH(2)Cl(2) at -60 degrees C in the presence of (S)-binaphthyl quaternary ammonium salt 4.
An enantioselective synthetic method for alpha-alkylserines by the phase-transfer catalytic alkylation of 2-phenyl-2-oxazo-line-4-carbonylcamphorsultam (4a) was developed. The phase-transfer catalytic alpha-alkylation of 4a using P2-Et at -78 degrees C gave alpha-alkylation (75 similar to 99%, 90 similar to 97% de), which could be easily hydrolyzed to alpha-alkylserines.
A Domino Michael/Dieckmann Process as an Entry to α-(Hydroxymethyl)glutamic Acid
作者:Carlos Aydillo、Gonzalo Jiménez-Osés、Alberto Avenoza、Jesús H. Busto、Jesús M. Peregrina、María M. Zurbano
DOI:10.1021/jo201067n
日期:2011.9.2
A domino process that involves a Michael-type addition followed by a Dieckmann reaction mediated by the participation of the cyclic carbamate group is the key step in the synthesis of both enantiomers of alpha-(hydroxymethyl)glutamic acid (HMG).