The First Preparation of 4-Substituted 1,2-Oxaborol-2(5H)-ols and their Palladium-Catalyzed Cross-Coupling with Aryl Halides to Prepare Stereodefined 2,3-Disubstituted Allyl Alcohols
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.
One-Pot Synthesis of Functionalized 2,5-Dihydrofurans via an Amine-Promoted Petasis Borono–Mannich Reaction
作者:Chun-Xiao Cui、Hui Li、Xian-Jin Yang、Jun Yang、Xiao-Qiang Li
DOI:10.1021/ol402782f
日期:2013.12.6
A series of functionalized 2,5-dihydrofurans were efficiently synthesized via an amine-promoted Petasisborono–Mannichreaction of 4-substituted 1,2-oxaborol-2(5H)-ols with salicylaldehydes in high yields. The process, which combines a boronic acid-based Mannich reaction and a highly efficient intramolecular SN2 cyclization, provides a one-step and efficient route toward 2,5-dihydrofurans from simple
通过胺促进的4-取代的1,2-氧杂硼-2(5 H)-醇与水杨醛的胺促进的Petasis borono-Mannich反应,可以高效合成一系列功能化的2,5-二氢呋喃。该方法结合了基于硼酸的曼尼希反应和高效的分子内S N 2环化,为从简单稳定的原料制备2,5-二氢呋喃提供了一步有效的途径。
Liebeskind–Srogl cross-coupling on γ-carboxyl-γ-butyrolactone derivatives: application to the side chain of amphidinolides C and F
The synthetic approach for the C20-C29 and C20-C34 fragments of amphidinolide F and C was based on an original Liebeskind-Srogl cross-coupling reaction with a glutarnic acid-derived building-block. Further highly diastereoselective reduction of the ketone was achieved by using an uncommon Ph3SiH/TBAF/HMPA system. The amphidinolide C side chain was built through a reductive elimination of chiral epoxide to install the stereogenic center at C29. (C) 2015 Elsevier Ltd. All rights reserved.