The sila-Pummerer reaction of γ-silyl substituted cycloalkanoyl sulfoxides: the first examples and a new approach to 3-substituted cycloalk-2-enones
摘要:
The thermal decomposition of 3-(alpha-trimethylsilyl)alkyl substituted 2-(phenylsulfinyl)cycloalkanones occurs via the gamma-sila-Pummerer reaction, affording 3-substituted cycloalk-2-enones and unstable trimethylsilyl benzenesulfenate as an elimination by-product. The starting gamma-silyl substituted cycloalkanoyl sulfoxides were obtained through the conjugate addition reaction of nucleophilic reagents to 2-(phenylsulfinyl)cycloalk-2-enones. The tandem conjugate addition/gamma-sila-Pummerer reaction investigated here provides a new route to 3-substituted cycloalk-2-enones. (C) 2014 Elsevier Ltd. All rights reserved.
3-(Dimethoxyphosphorylmethyl)cyclopent-2-enone was converted into (+/-)-prostaglandin B1 methyl ester in two steps involving regioselective alkylation at C(2) with methyl 7-iodoheptanoate and subsequent Horner-Wittig reaction with dimer of 2-hydroxyheptanal (42% overall yield). The use of (R)- and (S)-2-(tert-butyldimethylsilyloxy)heptanal for the Horner olefination reaction gave, after deprotection
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。
Phosphonate-Mediated Synthesis of Biologically Active Cyclopentanones and Cyclopentenones
作者:Marian Mikołajczyk
DOI:10.1080/10426500212213
日期:2002.6.1
3-(phosphorylmethyl)cyclopent-2-enones as well as a complete desymmetrization of meso -tartaric acid are discussed as a platform for developing the synthesis of racemic rosaprostol and enantiomeric forms of prostaglandin B 1 methyl ester, isoterrein, and neplanocin A.
3-(磷酰甲基)环戊-2-烯酮的合成和反应性以及内消旋酒石酸的完全去对称化作为开发外消旋罗沙前列醇和前列腺素 B 1 甲酯的对映体形式的合成的平台进行了讨论,isoterrein,和奈普诺星 A。
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
作者:Marian Mikołajczyk、Maciej Mikina、Aleksandra Jankowiak、Malose J. Mphahlele
DOI:10.1055/s-2000-6316
日期:——
Rosaprostol, an antiulcer drug, was prepared in five steps and in 36% overall yield starting from 3-(dimethoxyphosphorylmethyl)cyclopent-2-enone (6). The regioselective alkylation of 6 at C(2) with methyl 7-iodoheptanoate and subsequent Horner-Wittig reaction with pentanal constitute the key steps of this total synthesis.