Kirmse-Doyle- and Stevens-Type Rearrangements of Glutarate-Derived Oxonium Ylides
作者:Benedikt Skrobo、Nils E. Schlörer、Jörg-M. Neudörfl、Jan Deska
DOI:10.1002/chem.201704624
日期:2018.3.2
tetrahydrofuran building blocks. Here, the lipase‐catalyzed desymmetrization of 3‐alkoxyglutarates renders highly enantioenriched carboxylic acid intermediates, whose subsequent activation and oxonium yliderearrangement by means of rhodium or copper complexes furnishes functionalized O‐heterocycles with excellent diastereoselectivity. The two‐step protocol offers a streamlined and flexible synthesis of tetrahydrofuranones
Oxonium Ylide Rearrangement of Enzymatically Desymmetrized Glutarates
作者:Benedikt Skrobo、Jan Deska
DOI:10.1021/ol402887z
日期:2013.12.6
The combination of an enzyme-mediated enantioselective desymmetrization of readily available 3-benzyloxyglutarates and subsequent rhodium-catalyzed oxoniumyliderearrangement of their corresponding in situ derived diazo ketones offers a very concise and highly stereoselective access to functionalized tetrahydrofuranone building blocks.
activity of GABOB (4-amino-3-hydroxybutanoic acid), the structure of its protected derivatives makes them interesting chiral intermediates for the synthesis of more complex compounds. A stereoselective route to GABOB derivatives with three different protectinggroups is presented, using anhydride desymmetrization as a chirality-inducing step. Selective removal of the protectinggroups gave compounds
除了 GABOB(4-氨基-3-羟基丁酸)的多种生物活性外,其受保护衍生物的结构使它们成为合成更复杂化合物的有趣手性中间体。提出了一种具有三个不同保护基团的 GABOB 衍生物的立体选择性途径,使用酸酐去对称化作为手性诱导步骤。选择性去除保护基团得到带有游离羧酸或羟基的化合物。去除所有保护基团使得 GABOB 能够以良好的产率和优异的 ee 分离。
A convenient assay for the optical purity of monomethyl 3-hydroxypentanedioate
作者:Terry Rosen、Mikio Watanabe、Clayton H. Heathcock
DOI:10.1021/jo00193a044
日期:1984.9
ROSEN, J.;WATANABE, MIKIO;HEATHCOCK, C. H., J. ORG. CHEM., 1984, 49, N 19, 3657-3659