Novel Synthesis of 4-Carboxymethyl 5-Alkyl/Aryl Oxazolidin-2-ones by Rearrangement of 2-Carboxymethyl 3-Alkyl/Aryl N-tert-Butoxycarbonyl Aziridines
摘要:
A two-step approach for the diastereoselective synthesis of 4-carboxymethyl 5-alkyl/aryl oxazolidin-2-ones is described, which proceeds via the intermediate formation of a carboxymethyl 3-alkyl/aryl N-tert-butoxycarbonyl (N-Boc) aziridines. By reaction of N-Boc p-amino methyl esters with LiHMDS and iodine, trans 2,3-disubstituted N-Boc aziridines are obtained with high stereoselectivities and yields. The final rearrangement to oxazolidin-2-ones is achieved by treatment with a catalytic amount of a Lewis acid and proceeds with high yield and complete regio and stereoselectivity.
Novel Synthesis of 4-Carboxymethyl 5-Alkyl/Aryl Oxazolidin-2-ones by Rearrangement of 2-Carboxymethyl 3-Alkyl/Aryl N-tert-Butoxycarbonyl Aziridines
摘要:
A two-step approach for the diastereoselective synthesis of 4-carboxymethyl 5-alkyl/aryl oxazolidin-2-ones is described, which proceeds via the intermediate formation of a carboxymethyl 3-alkyl/aryl N-tert-butoxycarbonyl (N-Boc) aziridines. By reaction of N-Boc p-amino methyl esters with LiHMDS and iodine, trans 2,3-disubstituted N-Boc aziridines are obtained with high stereoselectivities and yields. The final rearrangement to oxazolidin-2-ones is achieved by treatment with a catalytic amount of a Lewis acid and proceeds with high yield and complete regio and stereoselectivity.
Regiospecific reductive ring cleavage of N-substituted aziridine-2-carboxylates and an aziridine-2-methanol via catalytic hydrogenation using Pd as a catalyst
作者:Yeonhwa Lim、Won Koo Lee
DOI:10.1016/0040-4039(95)01814-x
日期:1995.11
Regiospecific reductive ringcleavage was accomplished in the reaction of N-α-methylbenzyl substituted aziridine-2-carboxylate and aziridine-2-methanol under a catalytic hydrogenation condition. The regiospecificity was determined by the substituent at C-2.
N -α-甲基苄基取代的氮丙啶-2-羧酸酯和氮丙啶-2-甲醇在催化氢化条件下的反应完成了区域特异性还原环的裂解。区域特异性由C-2上的取代基确定。
Chiral Seleno-Amines from Indium Selenolates. A Straightforward Synthesis of Selenocysteine Derivatives
作者:Antonio L. Braga、Paulo H. Schneider、Marcio W. Paixão、Anna M. Deobald、Clovis Peppe、Diana P. Bottega
DOI:10.1021/jo060286b
日期:2006.5.1
A simple and efficient procedure for the synthesis of chiral beta-seleno-amines derivatives from a one-pot indium(I) iodide-mediated aziridine ring opening with diorganoyl diselenides has been developed. As an application, the synthesis of selenocysteine and selenotreonine derivatives has been accomplished.