Scalable Synthesis of Enantiomerically Pure <i>syn</i>-2,3-Dihydroxybutyrate by Sharpless Asymmetric Dihydroxylation of <i>p</i>-Phenylbenzyl Crotonate
作者:Daniel J. Smaltz、Andrew G. Myers
DOI:10.1021/jo2016746
日期:2011.10.21
An efficient four-step synthetic route to the useful chiral building block (2R,3S)-dihydroxybutyric acid acetonide in >95% ee is detailed. The sequence is readily scaled, requires no chromatography, and allows for efficient recycling of p-phenylbenzyl alcohol, an expedient for enantio- and diastereoenrichment by recrystallization.
Diastereoselective Additions of Allylmetal Reagents to Free and Protected <i>syn</i>-<b>α,β</b>-Dihydroxyketones Enable Efficient Synthetic Routes to Methyl Trioxacarcinoside A
作者:Daniel J. Smaltz、Jakub Švenda、Andrew G. Myers
DOI:10.1021/ol300377a
日期:2012.4.6
Two routes to the 2,6-dideoxysugar methyl trioxacarcinoside A are described. Each was enabled by an apparent α-chelation-controlled addition of an allylmetal reagent to a ketone substrate containing a free α-hydroxyl group and a β-hydroxyl substituent, either free or protected as the corresponding di-tert-butylmethyl silyl ether. Both routes provide practical access to gram quantities of trioxacarcinose
描述了 2,6-二脱氧糖甲基三恶癌苷 A 的两条路线。每一种都是通过将烯丙基金属试剂以明显的α-螯合控制添加到含有游离α-羟基和β-羟基取代基的酮底物上来实现的,该取代基可以是游离的或被保护为相应的二叔丁基甲基甲硅烷基醚。两种途径都提供了以适合糖苷偶联反应的形式实际获得克量的三氧癌糖A的途径。
The absolute configuration of the side chain diol moiety of the poison-frog alkaloid pumiliotoxin B
作者:Motokazu Uemura、Katsuhiko Shimada、Takashi Tokuyama、John W. Daly
DOI:10.1016/s0040-4039(00)85602-6
日期:1982.1
The absoluteconfiguration of the diol moiety in the side chain of pumiliotoxin B has been established by comparison of the ozonolysis product from pumiliotoxin B diacetate with the synthetic 3,4-diacetoxy-2-pentanone derived from L-(+)-tartaric acid. This indicates the absoluteconfiguration (R, R) of C-15, C-16 diol of pumiliotoxin B.