Enantioselective CuH-Catalyzed Hydroacylation Employing Unsaturated Carboxylic Acids as Aldehyde Surrogates
作者:Yujing Zhou、Jeffrey S. Bandar、Stephen L. Buchwald
DOI:10.1021/jacs.7b04937
日期:2017.6.21
(CuH)-catalyzed coupling of α,β-unsaturated carboxylic acids to aryl alkenes to access chiral α-aryl dialkyl ketones is reported. A variety of substrate substitution patterns, sensitive functional groups, and heterocycles are tolerated in this reaction, which significantly expands the range of accessible products compared with existing hydroacylation methodology. Although mechanistic studies are ongoing, we propose
Improved Synthesis of 1-O-Acyl-β-d-Glucopyranose Tetraacetates
作者:Yu Chen、Huan Lu、Yanyu Chen、Wansheng Yu、Hui Dai、Xianhua Pan
DOI:10.3390/molecules22040662
日期:——
An improvedsynthesis of 1-O-acyl glucosyl esters that avoids the use of expensive Ag reagents as well as the hydrolysis of unstable glucosyl bromides is reported. Notably, β-configuration products were obtained exclusively in good yields.
ALKYLDIENAMIDES EXHIBITING TASTE AND SENSORY EFFECT IN FLAVOR COMPOSITIONS
申请人:Dewis Mark L.
公开号:US20090311402A1
公开(公告)日:2009-12-17
Alkyldienamides compounds suitable for use as flavoring agents are disclosed. The compounds are used as flavors since they possess umami characteristics or other desirable organoleptic properties. The disclosed compounds are defined by the structure set forth below:
wherein R is ethyl or cyclopropyl; and
wherein R′ is methyl or butyl,
with the proviso that when R is ethyl, R′ is not methyl.
An amide compound represented by formula (I) has an excellent pest control effect. (In the formula, Y represents a 3-7 membered saturated heterocyclic ring which contains, as ring-forming components(s), one or more atoms or groups that are selected from the group consisting of an oxygen atom and —S(O)
t
—, the saturated heterocyclic ring may have one to three atoms or groups selected from group D and t represents 0 or the like; X represents a C
1
-C
10
chain hydrocarbon group which may have one or more atoms or groups that are selected from group A, or the like; W represents —CR
8
— or the like; r represents 1 or the like; R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
and R
8
may be the same or different and each represents a hydrogen atom or the like; and n represents 1 or the like.)
Nucleophilic Carbenes Derived from Dichloromethane
作者:Mingxin Liu、Nguyen Le、Christopher Uyeda
DOI:10.1002/anie.202308913
日期:2023.10.16
Nickel catalysts promote cyclopropanation reactions of electron-deficient alkenesusing dichloromethane as a methylene source. An asymmetric variant using a chiral pyridine-bis(oxazoline) ligand provides access to pharmaceutically relevant 2-aryl cyclopropyl carboxylates in highly enantioenriched form. The proposed mechanism involves the formation of a nucleophilic nickel carbene that reacts by a