Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Synthesis called (R)-Ethyl 4-tert-butoxy-3-hydroxybutanoate, a versatile chiral building block for EPC (enantiomerically pure compound) syntheses, by yeast reduction of ethyl 4-tert-butoxy-3-oxobutanoate, Author is Seebach, Dieter; Eberle, Martin, which mentions a compound: 58081-05-3, SMILESS is O=C1OC[C@H](O)C1, Molecular C4H6O3, SDS of cas: 58081-05-3.
Treatment of ROCH2COCH2CO2R1 (I; R = Me3C, R1 = Et) with baker’s yeast and sucrose in H2O at 28° for 4 days gave 72% (R)-ROCH2CH(OH)CH2CO2R1 (II; R = Me3C, R1 = Et) in 97% enantiomeric excess. Similar treatment of I (R = Me3C, R1 = Me; R = PhCH2, R1 = Et) gave 70 and 58% II in 82 and 56% enantiomeric excess resp.
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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem