A Cross-Coupling Approach to Amide Bond Formation from Esters
作者:Taoufik Ben Halima、Jaya Kishore Vandavasi、Mohanad Shkoor、Stephen G. Newman
DOI:10.1021/acscatal.7b00245
日期:2017.3.3
A palladium-catalyzed cross-coupling between aryl esters and anilines is reported, enabling access to diverse amides. The reaction takes place via activation of the C–O bond by oxidative addition with a Pd–NHC complex, which enables the use of relatively non-nucleophilic anilines that otherwise require stoichiometric activation with strong bases in order to react. High yields of aromatic, aliphatic
Heterogeneous Suzuki–Miyaura coupling of heteroaryl ester <i>via</i> chemoselective C(acyl)–O bond activation
作者:Hongpeng Ma、Chaolumen Bai、Yong-Sheng Bao
DOI:10.1039/c9ra02394a
日期:——
A site-selective supported palladium nanoparticle catalyzed Suzuki–Miyaura cross-coupling reaction with heteroaryl esters and arylboronic acids as coupling partners was developed. This methodology provides a heterogeneous catalytic route for aryl ketone formation via C(acyl)–O bond activation of esters by successful suppression of the undesired decarbonylation phenomenon. The catalyst can be reused
Mechanistic Investigations of the ZnCl<sub>2</sub>-Mediated Tandem Mukaiyama Aldol Lactonization: Evidence for Asynchronous, Concerted Transition States and Discovery of 2-Oxopyridyl Ketene Acetal Variants
作者:Cunxiang Zhao、T. Andrew Mitchell、Ravikrishna Vallakati、Lisa M. Pérez、Daniel Romo
DOI:10.1021/ja209163w
日期:2012.2.15
The ZnCl(2)-mediated tandem Mukaiyama aldol lactonization (TMAL) reaction of aldehydes and thiopyridyl ketene acetals provides a versatile, highlydiastereoselective approach to trans-1,2-disubstituted β-lactones. Mechanistic and theoretical studies described herein demonstrate that both the efficiency of this process and the high diastereoselectivity are highly dependent upon the type of ketene acetal
REACTIVE LEUCO COMPOUNDS AND COMPOSITIONS COMPRISING THE SAME
申请人:Milliken & Company
公开号:US20180118942A1
公开(公告)日:2018-05-03
A leuco composition comprises at least one reactive leuco compound, which reactive leuco compound comprises a leuco moiety and at least one reactive moiety covalently bound to the leuco moiety. A laundry care composition comprises a laundry care ingredient and a leuco composition. A method of treating a textile comprises the steps of (i) treating a textile with an aqueous solution containing a leuco composition, (ii) optionally, rinsing the textile, and (iii) drying the textile.
Total Synthesis of the Natural Herbicide MBH‐001 and Analogues
作者:Birgit Kuhn、David M. Barber、Hansjörg Dietrich、Uwe Döller、Michael G. Hoffmann、Dirk Schmutzler、Stefan Schnatterer、Martin E. Maier、Tamer Kocakaya、Marius Morkunas
DOI:10.1002/ejoc.202000294
日期:2020.4.23
Cyclic nitrones are the key: A flexible route to the natural herbicide MBH‐001 was developed. As opposed to azlactones, the use of the corresponding nitrones secured the regiochemistry (2 vs. 4‐position) in the aldol type reaction of the anions with aldehydes. The work also led to the determination of the relative and absolute stereochemistry of MBH‐001.