Chiral Aggregates Formed from Methylated Tetraenoic Fatty Acids: Formation of Both Antipodes of Chiral Aggregates from a Single Enantiomer and Time-Dependent Stereomutation
作者:Jianguo Ma、Hwan-Sung Cheon、Yoshito Kishi
DOI:10.1021/ol062834d
日期:2007.1.1
Formation and behaviors of chiral aggregates of methylated tetraenoic fatty acids (TE-FAs) were reported. In the C-24 TE-FA series, the aggregate prepared by dispersing an ethanol stock solution of C-24 TE-FA 1b into sodium phosphate buffer gave a strong positive Cotton effect, whereas the aggregate prepared from a methanol stock solution gave a negative Cotton effect. In the C-20 TE-FA series, the
作者:Jennifer A. Bodkin、Edward J. Humphries、Malcolm D. McLeod
DOI:10.1071/ch03121
日期:——
Careful control during the bromolactonization of β,γ;-unsaturated acid (4) was required to regioselectively afford the trans-β-lactone (3) as the major diastereomer. Radical debromination of (3) followed by a three-step sequence of reactions afforded the lipase inhibitor (–)-tetrahydrolipstatin (1).