Iron-Catalyzed Prins–Peterson Reaction for the Direct Synthesis of Δ<sup>4</sup>-2,7-Disubstituted Oxepenes
作者:Daniel A. Cruz、Victoria Sinka、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/acs.joc.8b01978
日期:2018.10.19
A direct iron(III)-catalyzed Prins–Peterson reaction involving α-substituted γ-triphenylsilyl bis-homoallylic alcohols and aldehydes is described. Thus, cis-Δ4-2,7-disubstituted oxepenes were synthesized in a diastereoselective reaction using sustainable catalytic conditions (3–5 mol %). This highly productive process is the result of a cascade of three chemical events with the concomitant formation
The anodicoxidation of α-keto and α-hydroxythloacetals provides an efficient way for the regeneration of α-diones and α-ketols, specially in the cases where chemical reactions are unsuccessful.
Horner Olefination Reaction in Organic Sulfur Chemistry and Synthesis of Natural and Bioactive Products
作者:Marian Mikołajczyk、Wanda H. Midura、Ashraf M. Mohamed Ewas、Wiesława Perlikowska、Maciej Mikina、Aleksandra Jankowiak
DOI:10.1080/10426500701734448
日期:2008.1.14
nates in tandem Michael addition/Horner olefination reaction leads to a wide range of carbocyclic and heterocyclic vinyl sulfoxides. In second part of this account a new strategy for the synthesis of functionalized cyclopentenones is briefly described. The synthesis and reactivity of 3-phosphorylmethyl-cyclopentenones is discussed as a platform for developing the synthesis of racemic rosaprostol, enantiomeric
本文概述了我们将霍纳烯化反应应用于合成不饱和硫化合物的工作结果。介绍了通过霍纳反应与 α-亚磺酰基甲基膦酸酯作为烯化试剂的外消旋和光学活性 α,β-不饱和亚砜的一般合成。我们展示了膦酸酯部分的结构如何控制上述反应中的 E 和 Z 立体选择性。在串联迈克尔加成/霍纳烯化反应中使用外消旋和光学活性 α-亚磺酰基乙烯基膦酸酯可产生多种碳环和杂环乙烯基亚砜。本报告的第二部分简要描述了合成功能化环戊烯酮的新策略。
A Short Synthesis of Enantiomeric
Phytoprostanes B<sub>1</sub> Type I
作者:Marian Mikołajczyk、Wiesława Perlikowska
DOI:10.1055/s-0029-1216883
日期:——
3-[(dimethoxyphosphoryl)methyl]cyclopent-2-enone is reported. It consists of three steps including regioselectivealkylation of the substrate at C(2) with methyl 8-bromooctanoate, subsequent Horner reaction with enantiomeric O-benzoyl-protected α-hydroxybutanals and final methanolysis. This affords the product in 25% overall yield. phytoprostanes - cyclopentenone phosphonates - alkylation - Horner alkenation
Shortest Enantioselective Total Syntheses of (+)-Isolaurepinnacin and (+)-Neoisoprelaurefucin
作者:Victoria Sinka、Daniel A. Cruz、Víctor S. Martín、Juan I. Padrón
DOI:10.1021/acs.orglett.2c01769
日期:2022.7.29
The shortest enantioselectivetotalsyntheses of (+)-isolaurepinnacin and (+)-neoisoprelaurefucin have been accomplished. These syntheses were based on a common parallel synthetic strategy using Prins–Peterson cyclization in their core construction. In only one step, a seven-membered ring oxacycle with the correct cis-stereochemistry ring closure and the Δ4 position of the endocyclic double bond in