Formation of Contiguous Quaternary and Tertiary Stereocenters by Sequential Asymmetric Conjugate Addition of Grignard Reagents to 2-Substituted Enones and Mg-Enolate Trapping
作者:Nicolas Germain、Alexandre Alexakis
DOI:10.1002/chem.201500292
日期:2015.6.1
tolerated for the ACA to 2‐methylcyclohexenone. The sequential ACA–enolate trapping, which leads to quaternarystereocenters, was then studied. Thus, many electrophiles have been tested, thereby giving rise to highly functionalized cyclic ketones with contiguous α‐quaternary and β‐tertiary centers. The present technique is believed to bring a new approach to versatile terpenoid‐like skeletons of bioactive
Copper-Catalysed Conjugate Addition of Grignard Reagents to 2-Methylcyclopentenone and Sequential Enolate Alkylation
作者:Beatriz C. Calvo、Ashoka V. R. Madduri、Syuzanna R. Harutyunyan、Adriaan J. Minnaard
DOI:10.1002/adsc.201400085
日期:2014.6.16
The copper/Rev‐JosiPhos‐catalysed asymmetric conjugateaddition of Grignard reagents to 2‐methylcyclopentenone (1) provides 2,3‐disubstituted cyclopentanones in high yields and enantioselectivities, and good diastereoselectivities. Reaction of the in situ formed enolate with various alkylating reagents in the presence of 1,3‐dimethyltetrahydropyrimidine‐2(1H)‐one (DMPU) affords the corresponding products
Stereochemical studies. X. Synthesis of some epimeric δ-lactones
作者:Ellen Cooke、Themistocles C. Paradellis、John T. Edward
DOI:10.1139/v82-006
日期:1982.1.1
Stereospecific syntheses are reported for the δ-lactones 3, 5, 8, 17, and 26.
报道了δ-内酯3、5、8、17和26的立体特异性合成。
Electroorganic chemistry. XXI. Selective formation of .alpha.-acetoxy ketones and general synthesis of 2,3-disubstituted 2-cyclopentenones through the anodic oxidation of enol acetates
作者:Tatsuya Shono、Masahisa Okawa、Ikuzo Nishiguchi
DOI:10.1021/ja00854a030
日期:1975.10
Milbemycin-avermectin studies. 5. Total synthesis of milbemycin .beta.3 and its C(12) epimer
作者:Steven R. Schow、Jonathan D. Bloom、Andrew S. Thompson、Kevin N. Winzenberg、Amos B. Smith