Application of Enantioselective Sulfur Ylide Epoxidation to a Short Asymmetric Synthesis of Bedaquiline, a Potent Anti-Tuberculosis Drug
作者:Maryam Bashir、Muhammad Arshad、Robina Begum、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.3c01286
日期:2023.6.16
A highly selective asymmetricsynthesis of a potent anti-TB drug (−)-bedaquiline is accomplished using sulfur ylide asymmetric epoxidation, employing (+)-isothiocineole as an inexpensive and readily available chiral sulfide. Excellent enantioselectivity (er 96:4) and diastereoselectivity (dr 90:10) were obtained for the construction of the key diaryl epoxide, which was subsequently subjected to a highly
[EN] ANTIMICROBIAL COMPOSITION FOR ANIMAL FEED<br/>[FR] COMPOSITION ANTIMICROBIENNE DESTINÉE À DES ALIMENTS POUR ANIMAUX
申请人:TAMINCO BVBA
公开号:WO2021069572A1
公开(公告)日:2021-04-15
The invention relates to an anti-microbial composition [composition (C), herein after], wherein said composition (C) comprises from 60.00 to 94.45 % by weight (wt. %) of at least one monocarboxylic acid having from 1 to 5 carbon atoms, or a salt, or mixtures thereof; from 5.00 to 25.00 % by weight (wt. %) of at least one medium-chain fatty acid comprising from 6 to 12 carbon atoms or derivatives thereof, from 0.05 to 2.50 % by weight (wt. %) of at least one monoterpene; wherein said composition (C) is substantially free of aliphatic aldehydes having from 1 to 12 carbon atoms and wherein all wt. % are relative to the total weight of the composition (C).
[EN] METHODS OF USING FORMALDEHYDE-FREE ANTIMICROBIAL COMPOSITIONS IN ANIMAL BY-PRODUCT COMPOSITIONS<br/>[FR] PROCÉDÉS D'UTILISATION DE COMPOSITIONS ANTIMICROBIENNES EXEMPTES DE FORMALDÉHYDE DANS DES COMPOSITIONS DE SOUS-PRODUITS ANIMAUX
申请人:[en]EASTMAN CHEMICAL COMPANY
公开号:WO2022217031A1
公开(公告)日:2022-10-13
Formaldehyde is a common component of antimicrobial compositions for preserving animal feeds. However, the use of formaldehyde is coming under pressure and alternative antimicrobial compositions are needed. The present application discloses methods and/or uses of a formaldehyde-free antimicrobial composition comprising formic acid and propionic acid in the making of rendered animal protein compositions or in the inhibiting of the development ofSalmonellabacteria in animal by-product compositions (e.g., rendered animal proteins) while maintaining higher protein digestibility comparing with formaldehyde.
Stereospecific Ring Expansion of Chiral Vinyl Aziridines
作者:Matthew Brichacek、Mauricio Navarro Villalobos、Alexandra Plichta、Jon T. Njardarson
DOI:10.1021/ol200263g
日期:2011.3.4
In this report, it is demonstrated that chiral vinyl aziridines can be stereospecifically ring expanded. This synthetic approach allows controlled access to chiral 2,5-cis- or 2,5-trans-3-pyrroline products from starting materials with the appropriate aziridine geometry. Twenty three ringexpansion examples, most of which feature a stereospecific cyclization, are presented.
Practical and Highly Selective Sulfur Ylide Mediated Asymmetric Epoxidations and Aziridinations Using an Inexpensive, Readily Available Chiral Sulfide. Applications to the Synthesis of Quinine and Quinidine
作者:Ona Illa、Muhammad Arshad、Abel Ros、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1021/ja9100276
日期:2010.2.17
one-step synthesis of a chiral sulfide which exhibits outstanding selectivities in sulfur ylide mediated asymmetric epoxidations and aziridinations. In particular reactions of benzyl and allylic sulfonium salts with both aromatic and aliphatic aldehydes gave epoxides with perfect enantioselectivities and the highest diastereoselectivities reported to date. In addition reactions with imines gave aziridines