The syntheses of several unsaturated long-chain aminodiols of the sphingosine type are described. Their physical properties and biological activities are noted.
描述了几种鞘氨醇型不饱和长链氨基二醇的合成。记录了它们的物理性质和生物活性。
Enantioselective Synthesis of Allenes by Catalytic Traceless Petasis Reactions
作者:Yao Jiang、Abdallah B. Diagne、Regan J. Thomson、Scott E. Schaus
DOI:10.1021/jacs.6b11937
日期:2017.2.8
Allenes are useful functional groups in synthesis as a result of their inherent chemical properties and established reactivity patterns. One property of chemical bonding renders 1,3-substituted allenes chiral, making them attractive targets for asymmetric synthesis. While there are many enantioselective methods to synthesize chiral allenes from chiral starting materials, fewer methods exist to directly
Selective Oxidation of Propargylic Alcohols into α,β-Acetylenic Aldehydes with a TiCl4/Et3N System
作者:Zhenfu Han、Hiroshi Shinokubo、Koichiro Oshima
DOI:10.1055/s-2001-16807
日期:——
A TiCl4/Et3N combination proved to be effective for the selective oxidation of propargylic alcohols into α,β-acetylenic aldehydes in good yields. Treatment of 2-hexyne-1,6-diol with TiCl4/Et3N provided 6-hydroxy-2-hexynal in good yield.
in two steps from the key C5‐DAC rac‐TIPS‐C≡C‐CH(OH)‐C≡CH and aldehydes. Kinetic resolution of the (S)‐C5‐DAC in 97 % ee and (R)‐C5‐DAC in 99 % ee was achieved by sequential lipase‐mediated acetylation/hydrolysis using the Candida antartica lipase (Novozyme 435). The four internal AllAC stereoisomers were prepared by asymmetric methinylation with (R)‐ or (S)‐diphenylprolinol as chiral auxiliary. Cytotoxicity
Copper(II)-Catalyzed Silylation of Activated Alkynes in Water: Diastereodivergent Access to<i>E</i>- or<i>Z</i>-β-Silyl-α,β-Unsaturated Carbonyl and Carboxyl Compounds
作者:Joseph A. Calderone、Webster L. Santos
DOI:10.1002/anie.201310695
日期:2014.4.14
Copper(II)‐catalyzed silylation of substituted alkynylcarbonyl compounds was investigated. Through the activation of Me2PhSiBpin in water at room temperature and open atmosphere, vinylsilanes conjugated to carbonyl groups are synthesized in high yield. A surprising diastereodivergent access to olefin geometry was discovered using a silyl conjugate addition strategy: aldehydes and ketones were Z selective
研究了铜(II)催化的取代炔基羰基化合物的硅烷化反应。通过在室温和开放气氛下在水中活化 Me 2 PhSiBpin,可以高产率合成与羰基共轭的乙烯基硅烷。使用甲硅烷基共轭加成策略发现了对烯烃几何形状的惊人非对映发散途径:醛和酮具有 Z 选择性,而酯和酰胺仅转化为E 产物。