Zobrazeno 1 - 10
of 105
pro vyhledávání: '"Heewon Lee"'
Publikováno v:
IEEE Access, Vol 9, Pp 54184-54189 (2021)
At various low-temperature conditions, it is difficult to obtain an accurate sensing response due to temperature-dependent material properties such as bandgap and resistivity of semiconductors. In this study, a gallium nitride (GaN)-based ultraviolet
Autor:
Heewon Lee, Nelu Grinberg, Nitinchandra D. Patel, Andrew Ye, Azad Hossain, Carl A. Busacca, Jon C. Lorenz, Chris H. Senanayake, Anjan Saha, Denis Byrne, Nizar Haddad, Suresh R. Kapadia, Xudong Wei, Nathan K. Yee, Philomen DeCroos, Bikshandarkoil A. Narayanan, Max Sarvestani, Scott Pennino
Publikováno v:
The Journal of Organic Chemistry. 85:8339-8351
An efficient general methodology for the synthesis of 4-quinolinyl ethers is demonstrated via a highly reactive SNAr reaction of 4-quinolinyl sulfones with a range of structurally diversified 1°, 2°, and 3° alcohols with a wide substrate scope and
Autor:
Yibo Xu, Jeff J. Song, Yuwen Wang, Li Zhang, Frank Roschangar, Zhengxu S. Han, Linglin Wu, Hao Wu, Heewon Lee, Yongda Zhang, Chris H. Senanayake, Bo Qu, Ling Wu
Publikováno v:
Tetrahedron Letters. 60:1834-1837
A new class of N H Bronsted acid organocatalysts that feature P-stereogenic chirality was developed. These catalysts were prepared from P-stereogenic chiral phosphinamides and show similar reactivity to BINOL derived phosphoric acid toward the reduct
Autor:
Denis Byrne, Zhengxu S. Han, Philomen DeCroos, Bo Qu, Frank Roschangar, Larry Nummy, Yibo Xu, Jinhua J. Song, Jon C. Lorenz, Ling Wu, Chris H. Senanayake, Kanwar Sidhu, Heewon Lee
Publikováno v:
Organic Process Research & Development. 23:263-268
Process development for a scalable and green synthesis of chiral tert-butanesulfinamide (TBSA) on a multikilogram scale is reported. The process is based on the identification of a chiral sulfinyl transfer agent, benzo[1,3]oxathiozin-2-one, that cont
Publikováno v:
Journal of the mechanical behavior of biomedical materials. 118
Polydimethylsiloxane (PDMS) polymer has been widely used in the biomedical fields because of its bio-compatibility, being used as sensors, medical equipment and tissue implants. The present study aims to synthesize and characterize micro lane-type su
Autor:
Christian A. Malapit, Heewon Lee, Sonia Rodriguez, Hari P. R. Mangunuru, Carl A. Busacca, Chris H. Senanayake, Nathan K. Yee, Bo Qu, Nizar Haddad, Jinhua J. Song, Jonathan T. Reeves
Publikováno v:
Synthesis. 50:4435-4443
The Pd-catalyzed 3-arylation of 2-oxindoles with aryl bromides, chlorides and triflates is found to proceed using i-Pr-BI-DIME and Me2-BI-DIME ligands. The mono-arylation of 3-unsubstituted oxindoles is accomplished using a Pd2(dba)3/i-Pr-BI-DIME cat
Autor:
Amy R. Howell, Yibo Xu, Heewon Lee, Nizar Haddad, Yongda Zhang, Zhengxu S. Han, Jean-Nicolas Desrosiers, Jinhua J. Song, Nathan K. Yee, Linglin Wu, Xiao-Jun Wang, Kendricks S. Lao, Chris H. Senanayake, Joshua D. Sieber
Publikováno v:
Synthesis. 50:4429-4434
A new family of dihydrobenzoazaphosphosphole ligands was prepared and shown to enable modification of the phosphine electronic character by variation of the N-substituent. This new family of phosphines was shown to be highly active in the Pd-catalyze
Autor:
Yanchao Xin, Frank Roschangar, Zeena Williams, Denis Byrne, Dmitry Kurouski, Jason A. Mulder, Jinhua J. Song, Alice T. Granger, Laurence J. Nummy, Jon C. Lorenz, Scott Pennino, Frederic G. Buono, Chris H. Senanayake, Yaping Hong, Ajith Premasiri, Nathan K. Yee, Joe Gao, Sonia Rodriguez, Xinzhu Zhang, Bo Qu, Jack D. Brown, Rogelio P. Frutos, Bikshandarkoil A. Narayanan, Zhantong Mao, Azad Hossain, Ning Li, Mariusz Krawiec, Heewon Lee, Yongda Zhang, Zhengxu S. Han, Nizar Haddad, Zhibin Li, Yibo Xu, Nelu Grinberg, Joshua D. Sieber, Carl A. Busacca
Publikováno v:
The Journal of Organic Chemistry. 83:1448-1461
A chromatography-free, asymmetric synthesis of the C2-symmetric P-chiral diphosphine t-Bu-SMS-Phos was developed using a chiral auxiliary-based approach in five steps from the chiral auxiliary in 36% overall yield. Separtion and recovery of the auxil
Autor:
Joshua D. Sieber, Heewon Lee, Yongda Zhang, Sergei Tcyrulnikov, Jean-Nicolas Desrosiers, Joyce C. Leung, Nathan K. Yee, Olga V. Zatolochnaya, Kendricks S. Lao, Sonia Rodriguez, Soumik Biswas, Hari P. R. Mangunuru, Bo Qu, Nelu Grinberg, Daniel Rivalti, Chris H. Senanayake, Xiao-Jun Wang, Guisheng Li, Marisa C. Kozlowski, Nizar Haddad, Jinhua J. Song
Publikováno v:
Chemical Science. 9:4505-4510
A new class of tunable heterophosphole dimeric ligands have been designed and synthesized. These ligands have enabled the first examples of Cu-catalyzed hydrogenation of 2-substituted-1-tetralones and related heteroaryl ketones via dynamic kinetic re
Autor:
Zhengxu S. Han, Heewon Lee, Yongda Zhang, Chris H. Senanayake, Hao Wu, Frank Roschangar, Nelu Grinberg, Bo Qu, Dan Wang, Guijun Wang, Jinhua J. Song, Yibo Xu
Publikováno v:
Advanced Synthesis & Catalysis. 359:3927-3933
P-Stereogenic chiral phosphine BI-BOP is employed for the first time as ligand to promote catalytic enantioselective synthesis of phosphoryl-substituted atropisomeric vinylarenes through a palladium−carbene pathway. This strategy utilizes 10 mol% p