Enzymatic and chromatographic resolution procedures applied to the synthesis of the phosphoproline enantiomers
摘要:
The preparation of enantiomerically pure pyrrolidine-2-phosphonic acid (phosphoproline, Pro(P)) has been addressed through the synthesis of suitable racemates and subsequent resolution by independent enzyme-catalyzed and chiral HPLC methods. First, racemic phosphoproline derivatives bearing the necessary protecting groups have been synthesized in excellent global yields starting from inexpensive materials. Preparative HPLC resolution of the N-Cbz-protected aminophosphonate on a cellulose-based column allowed the isolation of enantiomerically pure enantiomers on a gram scale. Enzyme-catalyzed alkoxycarbonylation of the aminophosphonate was studied using different lipases, solvents, and carbonates. Candida antarctica lipase type A (CAL-A) provided the highest enantioselectivity when combined with benzyl 3-methoxyphenyl carbonate. (c) 2015 Elsevier Ltd. All rights reserved.
Enzymatic and chromatographic resolution procedures applied to the synthesis of the phosphoproline enantiomers
摘要:
The preparation of enantiomerically pure pyrrolidine-2-phosphonic acid (phosphoproline, Pro(P)) has been addressed through the synthesis of suitable racemates and subsequent resolution by independent enzyme-catalyzed and chiral HPLC methods. First, racemic phosphoproline derivatives bearing the necessary protecting groups have been synthesized in excellent global yields starting from inexpensive materials. Preparative HPLC resolution of the N-Cbz-protected aminophosphonate on a cellulose-based column allowed the isolation of enantiomerically pure enantiomers on a gram scale. Enzyme-catalyzed alkoxycarbonylation of the aminophosphonate was studied using different lipases, solvents, and carbonates. Candida antarctica lipase type A (CAL-A) provided the highest enantioselectivity when combined with benzyl 3-methoxyphenyl carbonate. (c) 2015 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of <i>H</i>-Phosphinic Acids Bearing Natural Amino Acid Residues
作者:Qiuli Yao、Chengye Yuan
DOI:10.1021/jo400798f
日期:2013.7.19
The first systematic study on the asymmetric synthesis of H-phosphinic acids bearing natural protein amino acid residues was reported on the basis of the asymmetric addition of ethyl diethoxymethylphosphinate to N-tert-butane-sulfinyl imines. Good yields and moderate to high enantiose-lectivities were obtained. Reliable methods were developed for the elucidation of the stereochemistry of these phosphinic acids and derivatives thereof. The transformation of the side chains of these analogues was studied. Methods for the conversion of the alpha-aminophosphinates to oligopetides were reported.