以优异的对映选择性和高产率实现了用于合成半缩醛的乙烯基羰基化合物的有机催化 α-烷基化反应生成羟基硝基烯烃。通过添加 Et 3 N实现了高非对映选择性(高达 >20:1)。乙烯基酮对硝基烯烃的 α-和 γ-烷基化显示出高但相反的表面选择性。已证明半缩醛产物转化为其他多环化合物,包括euroticin B 类似物。
A One-Pot Synthesis of 2-Aminopyrimidines from Ketones, Arylacetylenes, and Guanidine
作者:Elena Yu. Schmidt、Inna V. Tatarinova、Nadezhda I. Protsuk、Igor’ A. Ushakov、Boris A. Trofimov
DOI:10.1021/acs.joc.6b02233
日期:2017.1.6
The three-component reaction of ketones, arylacetylenes, and guanidine catalyzed by the KOBut/DMSO system leads to 2-aminopyrimidines in up to 80% yield. Depending on structure of the starting ketones, the aromatization of intermediate dihydropyrimidines occurs either with loss of hydrogen molecules or methylbenzenes. The latter process takes place in the ketones, in which one of the substituents is
KOBu t / DMSO系统催化的酮,芳基乙炔和胍的三组分反应可产生高达80%收率的2-氨基嘧啶。取决于起始酮的结构,中间体二氢嘧啶的芳构化在氢分子或甲基苯损失的情况下发生。后一种方法发生在酮中,其中一个取代基不是甲基。对于二烷基-,芳基(杂芳基)烷基-和环烷基酮而言,反应条件是容许的。
Transition-Metal-Catalyzed Rearrangement of 1,1-(Oligomethylene)-4-aryl-2-butene-1,4-diols: Ring Expansion vs. Aryl Group Migration
transition-metal-catalyzed rearrangement of 1,1-(oligomethylene)-4-aryl-2-butene-1,4-diols was investigated. In the presence of PdCl(2)(MeCN)(2) and Cu(OTf)(2), a rapidly equilibrating 1,3-isomerization is followed by 1,2-migration to produce cyclopentanones or cyclohexanones through expansion Of four- or five-membered ringsystems. When employing larger ringsystems or acyclic cores, aryl migration provides 2-aryl
PROCESS FOR THE PREPARATION OF ORGANIC COMPOUNDS WITH MANGANESE CATALYSTS OR THE LIKE
申请人:Daicel Chemical Industries, Ltd.
公开号:EP1178031B1
公开(公告)日:2012-02-01
15-[(Z)-Phenylmethylidene]-7,14-dioxadispiro[5.1.5.2]pentadecanes: stereoselective one-pot assembly from cyclohexanones and phenylacetylene in a KOH/DMSO suspension
作者:Elena Yu Schmidt、Nadezhda V. Zorina、Elena V. Skitaltseva、Igor A. Ushakov、Albina I. Mikhaleva、Boris A. Trofimov
DOI:10.1016/j.tetlet.2011.05.056
日期:2011.7
Cyclohexanones react with phenylacetylene in a KOH/DMSO suspension (80 degrees C, 1 h) to give unexpectedly phenylmethylidene dispirocyclic ketals, 15-[(Z)-phenylmethylidene]-7,14-dioxadispiro[5.1.5.2]pentadecanes, in 16-22% yields (along with the anticipated beta,gamma- and alpha,beta-ethylenic ketones). (C) 2011 Elsevier Ltd. All rights reserved.
2-Aminopyrimidines in just two steps from ketones, acetylenes and guanidine via β,γ enones
作者:Elena Yu. Schmidt、Inna V. Tatarinova、Elena V. Ivanova、Boris A. Trofimov
DOI:10.1016/j.mencom.2017.05.022
日期:2017.5
Available beta,gamma-enones, the products of nucleophilic addition of ketones to phenylacetylene, react with guanidine in the KOH/DMSO system at 70 degrees C to give 2-aminopyrimidines in up to 72% yield.