A total synthesis of the enantiomer of anhydromyriocin (anhydrothermozymocidin)
作者:Daniel R. Payette、George Just
DOI:10.1139/v81-044
日期:1981.1.15
The optical antipode of anhydromyriocin, the γ-lactone derived from the antibiotic myriocin (thermozymocidin), was synthesized from L-arabinose, establishing the absolute configuration of myriocin as 47. In contrast to its natural enantiomer, it showed but little antifungal activity.
Asymmetric totalsynthesis of ISP-I has been achieved by utilizing highly selective E-olefin formation based on the Schlosser-modified Wittig reaction and highly diastereoselective aldol reactions employing both chiral heterocyclic derivatives, 3-acetyl-(4S)-isopropyl-1,3-thiazolidine-2-thione and ethyl [(5R)-2,5-dihydro-5-isopropyl-3,6-diethoxypyrazin]-2-yl carboxylate.
Kinetic and thermodynamic control of L-Threonine aldolase catalyzed reaction and its application to the synthesis of mycestericin D
作者:Kayoko Shibata、Kazushi Shingu、Vassil P. Vassiley、Kiyoharu Nishide、Tetsuro Fujita、Manabu Node、Tetsuya Kajimoto、Chi-Huey Wong
DOI:10.1016/0040-4039(96)00430-3
日期:1996.4
L-Threoninealdolasecatalyzes the aldol condensation of γ-benzyloxybutanal and glycine with high erythrolthreo selectivity under a kineticallycontrolled condition. The erythro product was used in the synthesis of mycestericinD, a potent immunosupressant.
A stereoselective approach toward sphingofungin F has been realized from l-quebrachitol. This synthesis featured a substrate-controlled asymmetric Michael addition, a regiospecific methylsulfonate elimination to construct the contiguous chiral centers in the target molecule.
A Flexible Common Approach to α-Substituted Serines and Alanines: Diastereoconvergent Syntheses of Sphingofungins E and F
作者:Bing Wang、Guo-Qiang Lin
DOI:10.1002/ejoc.200900772
日期:2009.10
A flexiblecommonapproach for the asymmetric syntheses of sphingofunginsE and F is reported, with efficient use of both diastereomers of the Baylis–Hillman adduct in a stereoconvergent manner. Pronounced steric effects of the 2-substituents in diastereoselective dihydroxylations of (E)-2-hydroxymethyl-2,3-alkenoates were observed. This strategy also allowed full control over the absolute configurations