Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Wen-Sen Li"'
Publikováno v:
IEEE Transactions on Antennas and Propagation. 70:7057-7072
Publikováno v:
2021 International Symposium on Antennas and Propagation (ISAP).
Autor:
Zhang, Hong, Li, Cui-Ping, Wang, Li-Li, Zhou, Zhuo-Da, Wen-Sen, Li, Kong, Ling-Yi, Ming-Hua, Yang
Publikováno v:
Chinese Chemical Letters; 20240101, Issue: Preprints
Publikováno v:
Tetrahedron Letters. 42:1827-1830
Cleavage of several 2,4-dimethoxybenzylmaleimides could be performed employing TFA in anisole. Electronic effects exemplified by varying the substitution present on the maleimide resulted in a variation in the rate of the deprotection. In contrast, 2
Autor:
Wen Sen Li, Kenneth J. Natalie, Lee J. Silverberg, John J. Venit, Shankar Swaminathan, Ambarish K. Singh, Raymond E. Weaver, James H. Simpson
Publikováno v:
Tetrahedron Letters. 39:4769-4772
The cyclization of acetal amide was carried out with trimethylsilyl trifluoromethanesulfonate, followed by elimination using sodium methoxide to give 2,5-disubstituted oxazole, thus completing a new route to the cardivascular drug ifetroban sodium.
Publikováno v:
Tetrahedron Letters. 35:6591-6594
We have found that in the presence of fluoride ion, nitrotoluenes of type 1 undergo Michael addition to activated α, β-unsaturated esters of type 2 in good to excellent yield (Scheme 1). The generality and limitation of this reaction and its applic
Autor:
Mark Liu, Chenkou Wei, Dale Vanyo, Rachel Mathew, William J. Winter, F. Taha Comezoglu, Kumar Gadamsetti, Victor W. Rosso, Ciro J. Spagnuolo, Gerald L. Powers, Atul S. Kotnis, Raymond E. Weaver, Ambarish K. Singh, Bich D. Phan, David A. Lust, Merrill L. Davies, Kenneth S. Bembenek, Wen-Sen Li, Venkatapuram A. Palaniswamy
Publikováno v:
Organic Process Research & Development. 7:25-27
The final step of the semisynthetic route to paclitaxel involves cleavage of the triethylsilyl (TES) protecting group from the C-7 hydroxyl group. Paclitaxel is an extremely complex molecule, and standard deprotection conditions led to formation of s
Autor:
John E. Thornton, Meena N. Rao, James H. Simpson, David J. Kacsur, and Daniel E. Kuehner, Wen-Sen Li, Ambarish K. Singh
Publikováno v:
Organic Process Research & Development. 6:618-620
A practical, safe, and high-yielding process for the cyclopropanation of a chiral epoxide has been developed using the inexpensive and nonhazardous reagents triethylphosphonoacetate and sodium tert-butoxide.
Autor:
John K. Thottathil, Polniaszek Richard P, Truc Chi Vu, Michael K. Wong, Wen-Sen Li, Kishta Katipally, John E. Thornton, Zhenrong Guo
Publikováno v:
Tetrahedron Letters. 43:1923-1925
Reduction of 2,6-diacetoxy-2′-bromoacetophenone ( 10 ) with NaBH 4 led to 3,4-diacetoxydihydrobenzofuran ( 12 ) in a process involving acyl migration followed by cyclization. Subsequent hydrogenolysis gave 4-acetoxydihydrobenzofuran which, upon sap
Autor:
Wen-Sen Li, Jianji Wang, Daniel J. Watson, Eric D. Dowdy, Nachimuthu Soundarajan, Robert P. Discordia, Miguel Rosingana
Publikováno v:
Tetrahedron Letters. 42:8935-8937
Using atmospheric O 2 as the stoichiometric oxidant, Pd 2+ /Cu 2+ -catalyzed oxidative cyclization of the corresponding bisindolylmaleimides provides the rebeccamycin aglycone and related indolo[2,3- a ]pyrrolo[3,4- c ]carbazoles in 58–88% yield. T