Pd(II)-Catalyzed Enantioselective C–H Activation/C–O Bond Formation: Synthesis of Chiral Benzofuranones
摘要:
Pd(II)-catalyzed enantioselective C-H activation of phenylacetic acids followed by an intramolecular C-O bond formation afforded chiral benzofuranones. This reaction provides the first example of enantioselecctive C-H functionalizations through Pd(II)/Pd(IV) redox catalysis.
Ligand-Accelerated Palladium(II)-Catalyzed Enantioselective Amination of C(sp<sup>2</sup>)–H Bonds
作者:Xiu-Fen Cheng、Fan Fei、Yan Li、Yi-Ming Hou、Xin Zhou、Xi-Sheng Wang
DOI:10.1021/acs.orglett.0c02216
日期:2020.8.21
The first example of the Pd(II)-catalyzed enantioselective amination of aryl C–H bonds is reported. The key to the successful realization of this asymmetric catalytic transformation was the identification of mono-N-protected α-amino-O-methylhydroxamic acid (MPAHA) ligands, which promote reactivity under mild conditions and control enantioselectivity. The counteranions in the solvent medium, hexafluoroacetylacetate
A Copper-Catalyzed Aerobic [1,3]-Nitrogen Shift through Nitrogen-Radical 4-<i>exo</i>
-trig Cyclization
作者:Yan Li、Rui Wang、Tao Wang、Xiu-Fen Cheng、Xin Zhou、Fan Fei、Xi-Sheng Wang
DOI:10.1002/anie.201709894
日期:2017.11.27
shift catalyzed by copper diacetate under an oxygen atmosphere (1 atm) has been developed for the construction of a diverse range of indole derivatives from α,α‐disubstituted benzylamine. In this reaction, oxygen was used as a clean terminal oxidant, and water was produced as the only by‐product. Five inert bonds were cleaved, and two C−N bonds and one C−C double bond were constructed in one pot during
Bistrzycki; Reintke, Chemische Berichte, 1905, vol. 38, p. 844
作者:Bistrzycki、Reintke
DOI:——
日期:——
PHOTOSENSITIVE POLYIMIDES
申请人:CHOU MENG-YEN
公开号:US20100086871A1
公开(公告)日:2010-04-08
The invention pertains to an epoxy-modified photosensitive polyimide, which possesses excellent heat resistance, chemistry resistance, and flexibility, and can be used in a liquid photo resist or dry film resist, or used in a solder resist, coverlay film, or printed circuit board.
Photosensitive polymides
申请人:Chou Meng-Yen
公开号:US20100086874A1
公开(公告)日:2010-04-08
The invention pertains to an isocyanate-modified photosensitive polyimide. The photosensitive polyimide of the invention possesses excellent heat resistance, chemical resistance and flexibility, and can be used in a liquid photo resist composition or dry film photo resist composition, or used in a solder resist, coverlay film, or printed wiring board.