500019-44-3Relevant academic research and scientific papers
Biocatalytic Parallel Interconnected Dynamic Asymmetric Disproportionation of α-Substituted Aldehydes: Atom-Efficient Access to Enantiopure (S)-Profens and Profenols
Tassano, Erika,Faber, Kurt,Hall, Mélanie
, p. 2742 - 2751 (2018/07/29)
The biocatalytic asymmetric disproportionation of aldehydes catalyzed by horse liver alcohol dehydrogenase (HLADH) was assessed in detail on a series of racemic 2-arylpropanals. Statistical optimization by means of design of experiments (DoE) allowed the identification of critical interdependencies between several reaction parameters and revealed a specific experimental window for reaching an ′optimal compromise′ in the reaction outcome. The biocatalytic system could be applied to a variety of 2-arylpropanals and granted access in a redox-neutral manner to enantioenriched (S)-profens and profenols following a parallel interconnected dynamic asymmetric transformation (PIDAT). The reaction can be performed in aqueous buffer at ambient conditions, does not rely on a sacrificial co-substrate, and requires only catalytic amounts of cofactor and a single enzyme. The high atom-efficiency was exemplified by the conversion of 75 mM of rac-2-phenylpropanal with 0.03 mol% of HLADH in the presence of ～0.013 eq. of oxidized nicotinamide adenine dinucleotide (NAD+), yielding 28.1 mM of (S)-2-phenylpropanol in 96% ee and 26.5 mM of (S)-2-phenylpropionic acid in 89% ee, in 73% overall conversion. Isolated yield of 62% was obtained on 100 mg-scale, with intact enantiopurities. (Figure presented.).
Highly Regio- and Enantioselective Copper-Catalyzed Reductive Hydroxymethylation of Styrenes and 1,3-Dienes with CO2
Gui, Yong-Yuan,Hu, Naifu,Chen, Xiao-Wang,Liao, Li-Li,Ju, Tao,Ye, Jian-Heng,Zhang, Zhen,Li, Jing,Yu, Da-Gang
supporting information, p. 17011 - 17014 (2017/12/06)
Herein, we report a highly regio- and enantioselective copper-catalyzed reductive hydroxymethylation of styrenes and 1,3-dienes with 1 atm of CO2. Diverse important chiral homobenzylic alcohols were readily prepared from styrenes. Moreover, a variety of 1,3-dienes also were converted to chiral homoallylic alcohols with high yields and excellent regio-, enantio-, and Z/E-selectivities. The utility of this transformation was demonstrated by a broad range of styrenes and 1,3-dienes, facile product modification, and synthesis of bioactive compounds (R)-(-)-curcumene and (S)-(+)-ibuprofen. Mechanistic studies demonstrated the carboxylation of phenylethylcopper complexes with CO2 as one key step.
Certain amino-pyridines and amino-triazines, compositions thereof, and methods for their use
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, (2015/10/28)
Provided are compounds of Formula I: or a pharmaceutically acceptable salt thereof, wherein R2, R4, R5, R6, R7, R8, R9, X, Z1, Z2, Z3, Z4 and m are as defined herein. Also provided is a pharmaceutically acceptable composition comprising a compound of Formula I, or a pharmaceutically acceptable salt thereof. Also provided are methods of using a compound of Formula I, or a pharmaceutically acceptable salt thereof.
CERTAIN HETEROCYCLES, COMPOSITIONS THEREOF, AND METHODS FOR THEIR USE
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, (2012/12/13)
Provided are compounds of Formula I: or a pharmaceutically acceptable salt thereof, wherein R1, R2, R3, R4, R5, R6, R7, X, Z1, Z2, Z3, Z4 and m are as defined herein. Also provided is a pharmaceutically acceptable composition comprising a compound of Formula I, or a pharmaceutically acceptable salt thereof. Also provided are methods of using a compound of Formula I, or a pharmaceutically acceptable salt thereof.
Highly regio- and enantioselective catalytic asymmetric hydroboration of α-substituted styrenyl derivatives
Mazet, Clement,Gerard, David
supporting information; experimental part, p. 298 - 300 (2011/02/24)
The catalytic asymmetric hydroboration of a variety of 1,1-disubstituted olefins has been achieved with excellent yields, perfect regioselectivity and in some cases, high levels of enantioselectivity using readily accessible iridium catalyst.
