| 摘要 |
Process for the preparation of L-homoalanin-4-yl(methyl)-phosphinic acid (esters) of the formula I <IMAGE> I (R, R1=H, alkyl) or salts thereof by reacting an R-3-isopropyl-2,5-dialkoxy-3,6-dihydropyrazine of the formula II with a beta -halogenoethyl(methyl)phosphinic acid ester of the formula IV <IMAGE> II <IMAGE> IV (R', R1'=alkyl) to give compounds of the formula V <IMAGE> V and then subjecting the latter to hydrolytic cleavage.
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