Synthesis and evaluation of phospholipid analogs as inhibitors of cobra venom phospholipase A2
作者:Wei Yuan、Richard J. Berman、Michael H. Gelb
DOI:10.1021/ja00260a020
日期:1987.12
Synthese d'analogues de phosphatidylcholine ou le groupe situe en 2 est remplace par des oxo-2 alkyle ou des hydroxy-2 alkyle
Synthese d'analogues de phosphatidylcholine ou le groupe situen en 2 est remplace par des oxo-2alkane ou des hydroxy-2烷基
Asymmetric Nitrocyclopropanation of α-Substituted α,β-Enals Catalyzed by Diphenylprolinol Silyl Ether for the Construction of All-Carbon Quaternary Stereogenic Centers
The diphenylprolinolsilylether mediated asymmetricnitrocyclopropanation of α-substitutedα,β-unsaturated aldehydes with bromonitromethane, followed by base-promoted isomerization was found to afford trans-nitrocyclopropanecarbaldehydes with all-carbonquaternarystereogeniccenters with excellent diastereo- and enantioselectivities. DFT calculations indicated that the s-trans conformer of the iminium
Saegusa Oxidation of Enol Ethers at Extremely Low Pd-Catalyst Loadings under Ligand-free and Aqueous Conditions: Insight into the Pd(II)/Cu(II)-Catalyst System
作者:Quan Zhu、Yunsong Luo、Yongyan Guo、Yushun Zhang、Yunhai Tao
DOI:10.1021/acs.joc.0c02987
日期:2021.4.16
system of Saegusa oxidation, which converts enolethers to the corresponding enals with a number of diverse substrates at extremely low catalyst loadings (500 mol ppm) under ligand-free and aqueous conditions, is described. Its synthetic utility was demonstrated by large-scale applications of the catalyst system to important nature molecules. This work allows Saegusa oxidation to become a highly practical
Synthesis and Structural Reassignment of Plakinidone
作者:Ze-Jun Xu、Dong-Xing Tan、Yikang Wu
DOI:10.1021/acs.orglett.5b02599
日期:2015.10.16
In connection with its first synthesis, plakinidone was structurally revised to a five-membered lactone. The key evidence for the previous assignment of this natural product as a perlactone was proven to be a misinterpretation of the MS data because of unawareness of a facile air oxidation. The synthetic samples also allowed for detection of differences in 13C NMR for diastereomers of remote stereogenic
在其首次合成过程中,将plakinidone结构上修改为五元内酯。以前将该天然产物指定为过内酯的关键证据被证明是对MS数据的误解,因为它不知道容易的空气氧化作用。合成样品还允许检测遥远的立体成因中心的非对映异构体的13 C NMR差异,以及空气氧化对旋光性的影响。
[EN] ODORANTS AND COMPOSITIONS COMPRISING ODORANTS<br/>[FR] ODORISANTS ET COMPOSITIONS COMPRENANT DES ODORISANTS
申请人:S H KELKAR AND COMPANY LTD
公开号:WO2021209944A1
公开(公告)日:2021-10-21
The present invention relates to new classes of odorous 3-(2- methylenealkoxy)alkanenitrile derivatives of formula (I) which are useful as fragrance or flavor materials in particular in providing dry, woody, dusty, earthy, and/or patchouli notes together with optional coriander, aldehydic, citrus, mandarin, pear, cinnamon, and/ or petal floral-like notes to perfume, aroma or deodorizing/masking compositions.