Synthesis of chiral n-protected α-amino-β-diketones from α-diazoketones derived from natural amino acids
摘要:
Alpha-Diazoketols, prepared by condensation of aldehydes or ketones with lithiated optically active alpha-diazoketones derived from natural amino acids, rearrange to homochiral alpha-amino-beat-diketones on treatment with rhodium(II) acetate.
PYRROLIDINE-SUBSTITUTED AZAINDOLE COMPOUNDS HAVING 5-HT6 RECEPTOR AFFINITY
申请人:Danca Mihaela Diana
公开号:US20100022581A1
公开(公告)日:2010-01-28
The present disclosure provides compounds having affinity for the 5-HT
6
receptor which are of the formula (I):
wherein R
1
, R
2
, A, B, D, E, G, Ar, and n are as defined herein. The disclosure also relates to methods of preparing such compounds, compositions containing such compounds, and methods of use thereof.
Application of a novel 1,3-diol with a benzyl backbone as chiral ligand for asymmetric oxidation of sulfides to sulfoxides
作者:Paramartha Gogoi、Trimurthulu Kotipalli、Kiran Indukuri、Somasekhar Bondalapati、Pipas Saha、Anil K. Saikia
DOI:10.1016/j.tetlet.2012.03.077
日期:2012.5
A chiral 1,3-diol with a benzyl backbone has been used for the asymmetricoxidation of sulfides to sulfoxides. Moderate to good yields and enantioselectivity (upto 87% ee) have been observed.
A versatile and practical method for regioselective synthesis of polysubstituted furanonaphthoquinones
作者:Zong-Ze Wu、Yeong-Jiunn Jang、Chia-Jui Lee、Yen-Te Lee、Wenwei Lin
DOI:10.1039/c2ob26986d
日期:——
An efficient and attractive synthesis of a series of novel poly-functionalized phosphorus zwitterions was achieved via three-component reactions of the corresponding functional nucleophiles, aldehydes, and Bu3P in the presence of acidic promoter. These polysubstituted zwitterions could regioselectively undergo further transformations to synthetically important furanonaphthoquinones and related products
[EN] PHOSPHORAMIDITE SYNTHESIS ON-DEMAND<br/>[FR] SYNTHÈSE DE PHOSPHORAMIDITE À LA DEMANDE
申请人:UNIV AARHUS
公开号:WO2022013393A1
公开(公告)日:2022-01-20
A process for synthesizing phosphoramidites by immobilizing a phosphitylating agent on an activated resin to create a loaded resin and then bringing the loaded resin into contact with a suitable substrate. The phosphoramidites are synthesized within minutes from applying the starting materials. Thus, the process makes it possible to create specific phosphoramidites on-demand as they are needed in further applications. The substrates to be applied are mostly nucleosides, thus to create nucleoside phosphoramidites for subsequent oligonucleotide synthesis.
Synthesis of Furo[2,3‐<i>f</i>]dibenzotropones <i>via</i> Intramolecular Wittig Reaction of Alkylidene Dibenzo‐<i>β</i>‐tropolones
作者:Po‐Chung Chien、Yi‐Ru Chen、You‐Jie Chen、Ching‐Fen Chang、Gangababu Marri、Wenwei Lin
DOI:10.1002/adsc.202301344
日期:2024.2.19
A strategy was developed for synthesizing furan-fused dibenzotropones via intramolecularWittigreactions of alkylidene dibenzo-β-tropolones and acylating reactants in catalytic or stoichiometric conditions. With these protocols, a series of furo[2,3-f]dibenzotropones were obtained in 49–99% yields within 1–10 hours. Mechanistic studies of the base-free phenomena revealed that the organophosphane acts
开发了一种通过亚烷基二苯并-β-托酚酮与酰化反应物在催化或化学计量条件下进行分子内维蒂希反应来合成呋喃稠合二苯并托酮的策略。通过这些方案,在 1-10 小时内获得了一系列呋喃并[2,3- f ]二苯并托酮,产率为 49-99%。无碱现象的机理研究表明,有机膦在加热下既充当介质又充当可再生的布朗斯台德碱。