A New Synthetic Method of (<i>Z</i>)-4-Aryl-but-2-en-1-ols via Suzuki-Miyaura Cross-Coupling Reaction of 4-Substituted 1,2-Oxaborol-2(5<i>H</i>)-ols with Benzyl Bromides
作者:Tao Yu、Xinyan Wu、Jun Yang
DOI:10.1002/cjoc.201201122
日期:2012.12
Z and E configuration 4‐aryl‐but‐2‐en‐1‐ols were isolated from several terrestrial plants, and (Z)‐4‐aryl‐but‐2en‐1‐ols were found to have choleretic activity. Strategies have been reported to synthesize (E)‐4‐aryl‐but‐2‐en‐1ols with high selectivity. However, there is no method to obtain (Z)‐4‐aryl‐but‐2‐en‐1‐ols with high selectivity now. We developed a Suzuki‐Miyaura cross‐coupling reaction of 1
Regioselective Synthesis of Functionalized Dihydropyrones via the Petasis Reaction
作者:Hui Li、Chun-xiao Cui、Guang-hua Zhang、Xiao-qiang Li、Jun Yang
DOI:10.1021/acs.joc.9b02651
日期:2020.1.17
A novel synthesis methodology for the construction of functionalized dihydropyrones has been developed with amines, glyoxylic acid, and 4-substituted-1,2-oxaborol-2(5H)-ols from the Petasisreaction. Mechanistic investigation indicated the intermolecular SN2 cyclization to provide 3,6-dihydro-2H-pyran-2-ones (3,6-DHP) and 5,6-dihydro-2H-pyran-2-ones (5,6-DHP) in one step with moderate to excellent
Suzuki–Miyaura cross-coupling reaction of 1,2-oxaborol-2(5H)-ols with carboxylic anhydrides: a new method to furans
作者:Tao Yu、Xin-Yan Wu、Jun Yang
DOI:10.1016/j.tetlet.2014.05.106
日期:2014.7
construct furans via a Suzuki–Miyaura cross-coupling reaction of 1,2-oxaborol-2(5H)-ols with carboxylicanhydrides. In the presence of Pd(OAc)2/PCy3, the multi-substituted alkenylboron compounds could couple with anhydrides to obtain furans in moderate-to-good yields. The addition of bases promoted the coupling reaction, and the plausible reaction mechanism was proposed.
An efficient HCl promoted Petasis reaction of 2-pyridinecarbaldehydes, amines and 1,2-oxborol-2(5H)-ols
作者:Tao Ding、Yazhen Duan、Hui Li、Baoguo Zhao、Jun Yang
DOI:10.1016/j.tetlet.2018.04.013
日期:2018.6
A Petasis reaction of 2-pyridinecarbaldehydes with various amines and 4-substituted 1,2-oxaborol-2(5H)-ols was developed. In the presence of HCl, the reaction proceeded smoothly under very mild conditions and the corresponding desired products were obtained in medium to excellent yields. This method allows the access a wide range of highly functionalized allylic alcohols, which might be useful compounds