(2S,3S)-1-Phenylthio-2,3-butanediol. A Useful Chiral Building Block for a Simple Syntheses of (4R,5S)-5-Hydroxyhexan-4-olide and (4R,5S)-5-Hydroxy-2-hexen-4-olide
Effect of Additives on Chemoselectivity and Diastereoselectivity in the Catalytic Epoxidation of Chiral Allylic Alcohols with Hydrogen Peroxide and Binuclear Manganese Complexes
作者:Hamdullah Kilic、Waldemar Adam、Paul L. Alsters
DOI:10.1021/jo801974e
日期:2009.2.6
chiral allylicalcohols 2 by manganese complexes of the cyclic triamine 1,4,7-trimethyl-1,4,7-triazacyclononane (tmtacn) 1 and hydrogen peroxide as oxygen donor in the presence of co-catalyst are investigated to understand the factors that affect the catalyst selectivity. Chemoselectivity and diastereoselectivity of catalyst 1 are significantly affected by the structure of the allylicalcohol and the
研究了在助催化剂存在下,环状三胺1,4,7-三甲基-1,4,7-三氮杂环壬烷(tmtacn)1和过氧化氢作为氧供体的锰配合物对手性烯丙基醇2的催化氧化,了解影响催化剂选择性的因素。烯丙醇的结构以及助催化剂的性质和量显着影响催化剂1的化学选择性和非对映选择性。H 2 O 2的添加摩尔当量(相对于基材为20-110 mol%)的影响更为明显。我们目前的结果反映了Mn催化剂1 / H 2的复杂氧化还原化学反应O 2 /助催化剂体系在烯烃氧化的早期阶段。
Stereoselective total synthesis of Aspergillide D
作者:Krishnaiah Kumari、Tasqeeruddin Syed、A. M. S. Krishna、Subhashini Muvvala、Annapurna Nowduri、Chidara Sridhar、Abhishek Saxena
DOI:10.1080/14786419.2022.2078321
日期:——
Abstract The totalsynthesis of the 16-membered Polyhydroxylated macrolide, Aspergillide D has been accomplished utilizing the Grignard reaction, Sharpless asymmetric epoxidation Regioselective ring opening of epoxy alcohol, Wittig olefination and Yamaguchi macrolactonisation as key steps. 3-butene-1-ol has been utilized as the starting material.
Photooxygenation of olefins in the presence of titanium(IV) catalyst. A convienient "one-pot" synthesis of epoxy alcohols.
作者:Waldemar Adam、Martin Braun、Axel Griesbeck、Vittorio Lucchini、Eugen Staab、Bernd Will
DOI:10.1021/ja00183a032
日期:1989.1
Orally bioavailable Syk inhibitors with activity in a rat PK/PD model
作者:Gebhard Thoma、Siem Veenstra、Ross Strang、Joachim Blanz、Eric Vangrevelinghe、Jörg Berghausen、Christian C. Lee、Hans-Günter Zerwes
DOI:10.1016/j.bmcl.2015.08.037
日期:2015.10
Design and optimization of benzo- and pyrido-thiazoles/isothiazoles are reported leading to the discovery of the potent, orally bioavailable Syk inhibitor 5, which was found to be active in a rat PK/PD model. Compound 5 showed acceptable overall kinase selectivity. However, in addition to Syk it also inhibited Aurora kinase in enzymatic and cellular settings leading to findings in the micronucleus assay. As a consequence, compound 5 was not further pursued. (C) 2015 Elsevier Ltd. All rights reserved.
Rapid synthesis of β-hydroxy-α-amino acids, such as L-threonine, β-hydroxyphenylalanine, and β-hydroxyleucine, via an application of the sharpless asymmetric epoxidation