Asymmetric synthesis using diisopropyl tartrate modified (E)- and (Z)-crotylboronates: preparation of the chiral crotylboronates and reactions with achiral aldehydes
作者:William R. Roush、Kaori Ando、Daniel B. Powers、Alan D. Palkowitz、Ronald L. Halterman
DOI:10.1021/ja00173a023
日期:1990.8
Crotylboronates undergo highly diastereo- and enantioselective reactions with aliphatic (linear or α-monobranched; 72-91% ee), aromatic and α,β-unsaturated aldehydes (55-74% ee). The reaction diastereoselectivity closely parallels the reagent isomeric purity especially for reactions performed at −78 o C. The enantioselectivity is best in toluene for all substrates except benzaldehyde where best results
巴豆基硼酸酯与脂肪族(线性或 α-单支链;72-91% ee)、芳香族和 α,β-不饱和醛(55-74% ee)发生高度非对映选择性和对映选择性反应。反应的非对映选择性与试剂异构体纯度密切相关,特别是对于在 -78 o C 下进行的反应。对所有底物的对映选择性在甲苯中最佳,但苯甲醛除外,因为苯甲醛在 THF 中获得最佳结果。本研究中合成的 14 种高烯丙醇中有 9 种的相对和绝对立体化学是通过与 Sharpless 不对称环氧化制备的环氧醇的相关性来确定的
An Efficient Synthesis of (–)-Posticlure: The Sex Pheromone ofOrgyia postica
2,3-epoxy derivatives as anti retrovital chemotherapeutic agents
申请人:The United States of America as represented by the Secretary of the
公开号:US05190969A1
公开(公告)日:1993-03-02
The present invention is related to compounds, compositions and methods of treating viral infections. Compounds of the present invention have the following general formula: ##STR1## wherein R is selected from --CH.sub.2 OH, --CO.sub.2 R.sup.2, --CONR.sup.3 R.sup.4, or COR.sup.5, wherein R.sup.2 is hydrogen or a lower alkyl group, R.sup.3 and R.sup.4 are each independently hydrogen or a lower alkyl group, R.sup.5 is an amino acid residue bound via a terminal nitrogen or peptide having at least two amino acid residues; and wherein R.sup.1 is C.sub.5 -C.sub.13 alkyl, aryl, aralkyl, aralkyl(lower alkyl) ether, or C.sub.5 -C.sub.13 alkyl (lower alkyl)ether.
2,3-epoxy alcohols, acids and derivatives as anti retroviral
申请人:The United States of America as represented by the Department of Health
公开号:US06153589A1
公开(公告)日:2000-11-28
The present invention is related to compounds, compositions and methods of treating viral infections. Compounds of the present invention have the following general formula: ##STR1## wherein R is selected from --CH.sub.2 OH, --CO.sub.2 R.sup.2, --CONR.sup.3 R.sup.4, or COR.sup.5, wherein R.sup.2 is hydrogen or a lower alkyl group, R.sup.3 and R.sup.4 are each independently hydrogen or a lower alkyl group, R.sup.5 is an amino acid residue bound via a terminal nitrogen or peptide having at least two amino acid residues; and wherein R.sup.1 is C.sub.5 -C.sub.13 alkyl, aryl, aralkyl, aralkyl(lower alkyl)ether, or C.sub.5 -C.sub.13 alkyl(lower alkyl)ether.