Introducing Deep Eutectic Solvents to Polar Organometallic Chemistry: Chemoselective Addition of Organolithium and Grignard Reagents to Ketones in Air
作者:Cristian Vidal、Joaquín García-Álvarez、Alberto Hernán-Gómez、Alan R. Kennedy、Eva Hevia
DOI:10.1002/anie.201400889
日期:2014.6.2
Despite their enormous synthetic relevance, the use of polar organolithium and Grignardreagents is greatly limited by their requirements of low temperatures in order to control their reactivity as well as the need of dry organic solvents and inert atmosphere protocols to avoid their fast decomposition. Breaking new ground on the applications of these commodity organometallics in synthesis under more
Structural and functional insights into asymmetric enzymatic dehydration of alkenols
作者:Bettina M Nestl、Christopher Geinitz、Stephanie Popa、Sari Rizek、Robert J Haselbeck、Rosary Stephen、Michael A Noble、Max-Philipp Fischer、Erik C Ralph、Hoi Ting Hau、Henry Man、Muhiadin Omar、Johan P Turkenburg、Stephen van Dien、Stephanie J Culler、Gideon Grogan、Bernhard Hauer
DOI:10.1038/nchembio.2271
日期:2017.3
elongated aromatic and aliphatic tertiary alcohols (C5–C15) that contain a specific signature motif demonstrate the broad substrate specificity of LinD. The three-dimensional structure of LinD from Castellaniella defragrans revealed a pentamer with active sites at the protomer interfaces. Furthermore, the structure of LinD in complex with the product geraniol provides initial mechanistic insights into
Rhodium-Catalyzed Allylic Substitution with an Acyl Anion Equivalent: Stereospecific Construction of Acyclic Quaternary Carbon Stereogenic Centers
作者:P. Andrew Evans、Samuel Oliver、Jungha Chae
DOI:10.1021/ja306602g
日期:2012.11.28
A highly regio- and stereospecific rhodium-catalyzed allylic alkylation of tertiary allylic alcohol derivatives with a cyanohydrin pronucleophile is described. This direct and operationally simple protocol provides a fundamentally novel approach toward the synthesis of α-quaternary substituted ketones and circumvents many of the inherent problems associated with conventional enolate alkylation reactions
The present invention relates to the use of specific organic compounds as flavor and fragrance material. Furthermore the invention relates to new specific organic compounds and their synthesis, as well to flavor and fragrance formulations comprising at least one of the specific organic compounds.
type of structure units is full of challenge due to their congested chemical environment. Herein, we report a new gold(I) self-relay catalysis merging [3,3]-sigmatropic rearrangement/Nazarov cyclization with allylic alkylation starting from 1,3-enyne acetates and allylic alcohols, producing a wide range of synthetically important allyl cyclopentenones with an all-carbon quaternary stereocenter in good