Stereoselective Synthesis of Highly Substituted Tetrahydrofurans through Diverted Carbene OH Insertion Reaction
作者:Simon M. Nicolle、William Lewis、Christopher J. Hayes、Christopher J. Moody
DOI:10.1002/anie.201502484
日期:2015.7.13
Copper‐ or rhodium‐catalyzed reactions of diazocarbonyl compounds with β‐hydroxyketones give highlysubstitutedtetrahydrofurans with excellent diastereoselectivity. Under mild conditions, the single‐step process starts as a carbene OH insertion reaction, but is diverted by an intramolecular aldol reaction.
Metal-Containing Ionic Liquids as Efficient Catalysts for Hydroxymethylation in Water
作者:Katharina Bica、Peter Gaertner
DOI:10.1002/ejoc.200800323
日期:2008.7
The iron-containing ionicliquid butylmethylimidazolium tetrachloroferrate (bmim-FeCl4) proved to be an efficient and recyclable catalyst for the hydroxymethylation of β-keto esters using aqueous formaldehyde and a low catalyst loading of up to 0.1 mol-% without co-solvents or additional surfactants. An useful and high-yielding approach to hydroxymethylated keto esters as well as to 3-disubstitued
Hydroxymethylation of active methenyl compounds: DMSO as methylene source and H2O as oxygen source
作者:Liang Zhang、Shuhua Liu、Yunliang Lin、Yuliang Wang
DOI:10.1016/j.tetlet.2022.153663
日期:2022.3
and efficient method for hydroxymethylation of active methenyl compounds has been described. In this transformation, the widely available solvents DMSO and H2O served as methylene and oxygen sources, respectively. Under promotion of activator and base, the reaction could be used for the construction of a series of α-hydroxymethylated carbonyl compounds with all-carbon quaternary carbon center in good
已经描述了一种温和有效的活性亚甲基化合物羟甲基化方法。在这种转化中,广泛使用的溶剂 DMSO 和 H 2 O 分别作为亚甲基和氧源。在活化剂和碱的促进下,该反应可用于构建一系列全碳季碳中心的α-羟甲基化羰基化合物,收率良好。
A chemo-enzymatic elaboration of a quarternary chiral center: an alternative approach to the side chain of furaquinocin D
these functionalities was achieved by a combination of stereoselective chemical and enzymatic reactions. The reduction of ethyl 2-hydroxymethyl-2-methyl-3-oxobutanoate with excess NaBH4 afforded ester with a high diastereomeric excess. After protecting the primary hydroxy group as TBDMS ether, the optical resolution was achieved by lipase-catalyzed hydrolysis of the corresponding chloroacetate in a highly
METHODS, COMPOUNDS, AND COMPOSITIONS FOR DELIVERING 1,3-PROPANEDISULFONIC ACID
申请人:Kong Xianqi
公开号:US20120208850A1
公开(公告)日:2012-08-16
The invention relates to methods, compounds, and compositions for delivering 1,3-propanedisulfonic acid (1,3PDS) in a subject, preferably a human subject. The invention encompasses compounds that will yield or generate 1,3PDS, either in vitro or in vivo. The invention also relates to sulfonate ester prodrugs of 1,3PDS as well as Gemini dimmers and oligomers of 1,3PDS for the prevention or treatment of associated diseases and conditions.