Asymmetric Synthesis of .beta.-Lactams via the Zinc-Mediated Glycine Ester Enolate-Imine Condensation Reaction Using .alpha.-Amino Esters as the Chiral Auxiliary
作者:Hendrik L. van Maanen、Henk Kleijn、Johann T. B. H. Jastrzebski、Jan Verweij、Antonius P. G. Kieboom、Gerard van Koten
DOI:10.1021/jo00119a009
日期:1995.7
Imine esters of glycine, (R)-phenylglycine, (R)-(1,4-cyclohexadienyl)glycine and (S)-valine have been employed in the ester enolate-imine condensation via double activation with ZnCl2. The reaction of the chlorozinc enolate (1b) of ethyl (2,2,5,5-tetramethyl-1-aza-2,5-disilacyclopentyl)acetate with (R)-methyl N-benzylidene-2-phenylglycinate (2a) afforded the trans-beta-lactam 3a in 79% yield with excellent asymmetric induction (de >97%). Other imine esters also afforded trans-beta-lactams diastereoselectively, albeit in lower conversions (37-70%). Methyl (S)-2-[N-[3-(trimethylsilyl)-2-propyn-1-ylidene]amino]-3-methylbutanoate (2e) afforded a mixture of four diastereoisomers (68% conversion). The products were isolated as 3-phthalimido beta-lactams 5b-e and as 3-[(methoxycarbonyl)amino]-beta-lactam 6b. The reactivity of the zinc enolates and the diastereoselectivity of the reactions are discussed in terms of the coordination of the imine esters to ZnCl2 (template effect) and the stability and aggregation equilibria of the zinc enolates.
Salt of Dihydrophenylglycine Methyl Ester
申请人:DSM Sinochem Pharmaceuticals Netherlands B.V.
公开号:US20180222848A1
公开(公告)日:2018-08-09
The present invention relates to the hemi sulfuric acid salt of methyl (R)-2-amino-2-(cyclohexa-1,4-dien-1-yl)acetate, also trivially referred to as the hemi sulfuric acid salt of D-dihydrophenylglycine methyl ester, to a method for the preparation of said salt and to the use of said salt in the enzymatic synthesis of antibiotics.