AbstractBy feeding growing cultures of Penicillium brefeldianum Dodge with [‐14C]‐acetate radioactive brefeldin A (C16H24O4) was obtained. By extensive degradation of [14C]‐brefeldin A, the individual radioactivity of 12 of the 16 carbon atoms was determined quantitatively. The pattern of the distribution of the radioactivity shows that 8 acetate units have been incorporated into the metabolite in a regular manner. These findings suggest an octaketide as an intermediate. Possible mechanisms for the formation of the trans‐fused cyclopentane ring are discussed.
A“Chiral Aldehyde” Equivalent as a Building Block Towards Biologically Active Targets
作者:Barry M. Trost、Matthew L. Crawley
DOI:10.1002/chem.200305634
日期:2004.5.3
by the Bayer corporation. These studies further inspired work that culminated in the total synthesis of (+)-brefeldin A, a natural product with a range of significant biological properties. All of the stereochemistry in this target molecule was derived from two palladium-catalyzedasymmetricallylicalkylation reactions. The trans-alkenes were synthesized by a Julia olefination and a ruthenium-catalyzed
Stereoselective Synthesis of Cyclohexanes via an Iridium Catalyzed (5 + 1) Annulation Strategy
作者:Wasim M. Akhtar、Roly J. Armstrong、James R. Frost、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1021/jacs.8b07776
日期:2018.9.26
An iridium catalyzed method for the synthesis of functionalized cyclohexanes from methyl ketones and 1,5-diols is described. This process operates by two sequential hydrogen borrowing reactions, providing direct access to multisubstituted cyclic products with high levels of stereocontrol. This methodology represents a novel (5 + 1) strategy for the stereoselective construction of the cyclohexane core
[EN] NUCLEIC ACID-POLYPEPTIDE COMPOSITIONS AND USES THEREOF<br/>[FR] COMPOSITIONS D'ACIDE NUCLÉIQUE-POLYPEPTIDE ET UTILISATIONS DE CELLES-CI
申请人:AVIDITY BIOSCIENCES INC
公开号:WO2020247782A1
公开(公告)日:2020-12-10
Disclosed herein are compositions and pharmaceutical formulations that comprise a binding moiety conjugated to a modified polynucleic acid molecule and a polymer. Also described herein include methods for treating a cancer which utilize a composition or a pharmaceutical formulation comprising a binding moiety conjugated to a polynucleic acid molecule and a polymer.
Stereoselective synthesis of alicyclic ketones: A hydrogen borrowing approach
作者:Roly J. Armstrong、Wasim M. Akhtar、James R. Frost、Kirsten E. Christensen、Neil G. Stevenson、Timothy J. Donohoe
DOI:10.1016/j.tet.2019.130680
日期:2019.11
A highly diastereoselective annulation strategy for the synthesis of alicyclic ketones from diols and pentamethylacetophenone is described. This process is mediated by a commercially available iridium(III) catalyst, and provides efficient access to a wide range of cyclopentane and cyclohexane products with high levels of stereoselectivity. The origins of diastereoselectivity in the annulation reaction
Lipase-Catalyzed Highly Enantioselective Kinetic Resolution of Boron-Containing Chiral Alcohols
作者:Leandro H. Andrade、Thiago Barcellos
DOI:10.1021/ol901091f
日期:2009.7.16
to obtain optically pure boron compounds is described. The kinetic resolution of boron-containing chiral alcohols via enantioselective transesterification catalyzed by lipases was studied. Aromatic, allylic, and aliphatic secondary alcohols containing a boronate ester or boronic acid group were resolved by lipase from Candida antartica (CALB), and excellent E values (E > 200) and high enantiomeric excesses