Enantioselective Propargylation of Polyols and Desymmetrization of <i>meso</i>
1,2-Diols by Copper/Borinic Acid Dual Catalysis
作者:Ren-Zhe Li、Hua Tang、Ke R. Yang、Li-Qiang Wan、Xia Zhang、Jie Liu、Zhengyan Fu、Dawen Niu
DOI:10.1002/anie.201703029
日期:2017.6.12
A copper/borinic acid dual catalytic reaction enabled the enantioselective propargylation of aliphatic polyols. Readily available reagents and catalysts were used in this transformation, which displayed good to excellent chemo‐ and stereoselectivity for a broad array of substrates. The method was also applicable to the desymmetrization of meso 1,2‐diols to furnish products with three stereogenic centers
Substituted heterocyclylisoquinolinium salts and compositions and method
申请人:Sterling Winthrop Inc.
公开号:US05569655A1
公开(公告)日:1996-10-29
Substitutued heterocyclylisoquinolinium salts, pharmaceutical compositions containing them and methods for the treatment or prevention of neurodegenerative disorders or neurotoxic injuries utilizing them.
Highly diastereoselective synthesis of tetrahydrobenzofuran derivatives by palladium-catalyzed reaction of propargylic esters with substituted β-dicarbonyl compounds
作者:Masahiro Yoshida、Mariko Higuchi、Kozo Shishido
DOI:10.1016/j.tet.2010.02.023
日期:2010.4
propargylic esters with 2-substituted cyclohexane-1,3-diones and 2-oxocyclohexanecarboxylic esters in the presence of palladium catalyst are described. Substituted tetrahydrobenzofuran derivatives having a quaternary carbon stereocenter were synthesized in a highly diastereoselective manner.
Substituted 6,11-ethano-6,11-dihydrobenzo[b] quinolizinium salts and
申请人:Sterling Winthrop Inc.
公开号:US05554620A1
公开(公告)日:1996-09-10
Substituted 6,11-ethano-6,11-dihydrobenzo[b]quinolizinium salts, pharmaceutical compositions containing them, and methods for the treatment of neurodegenerative disorders or neurotoxic injuries utilizing them, wherein the substituted 6,11-ethano-6,11-dihydrobenzo[b]quinolizinium salts have the formula: ##STR1## wherein: R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X and p are as defined in the specification.
替代的6,11-乙烷-6,11-二氢苯并[b]喹啉盐,含有它们的药物组合物,以及利用它们治疗神经退行性疾病或神经毒性损伤的方法,其中替代的6,11-乙烷-6,11-二氢苯并[b]喹啉盐具有以下结构式:##STR1## 其中:R.sup.1、R.sup.2、R.sup.3、R.sup.4、R.sup.5、R.sup.6、R.sup.7、X 和 p 如规范中所定义。
Asymmetric total synthesis of (−)-perforanoid A
作者:Chao Lv、Qian Tu、Jianxian Gong、Xiaojiang Hao、Zhen Yang
DOI:10.1016/j.tet.2017.03.072
日期:2017.6
Asymmetrictotalsynthesis of (−)-perforanoid A, a novel limonoid isolated from the leaves of Harrisonia perforata, has been achieved. The key features of our totalsynthesis include the Rh-catalyzed intramolecular Pauson–Khand reaction of an allene and an alkene, the Pd-catalyzed lactonization of an allylic alcohol with a vinyl ether, and the enantioselective alkenylation of 3-furaldehyde.