Catalytic asymmetric total synthesis of (S)-(−)-zearalenone, a novel lipoxygenase inhibitor
作者:Marc P. Baggelaar、Yange Huang、Ben L. Feringa、Frank J. Dekker、Adriaan J. Minnaard
DOI:10.1016/j.bmc.2013.06.024
日期:2013.9
A catalytic asymmetric synthesis of (S)-(−)-zearalenone is reported using asymmetric allylic alkylation for the introduction of the stereocenter. (S)-(−)-Zearalenone turned out to be a novel lipoxygenase inhibitor.
Metal(II)<i>d</i>-Tartrates Catalyzed Asymmetric Ring Opening of Oxiranes with Various Nucleophiles
作者:Hiroyuki Yamashita
DOI:10.1246/bcsj.61.1213
日期:1988.4
The asymmetricringopening of meso-2,3-disubstituted oxiranes with thiols, aniline, and trimethylsilyl azide was studied by the use of metal(II) d-tartrates as heterogeneous chiral Lewis acid catalysts. The enantioselectivity varied widely with the combination of oxirane, nucleophile, and metal(II) d-tartrate, and Zn(II) d-tartrate gave the best enantioselectivity in the respective reactions of 1
通过使用金属 (II) d-酒石酸盐作为非均相手性路易斯酸催化剂,研究了具有硫醇、苯胺和三甲基甲硅烷基叠氮化物的 meso-2,3-di 取代的环氧乙烷的不对称开环。对映选择性随环氧乙烷、亲核试剂和金属 (II) d-酒石酸盐的组合而变化很大,并且 Zn(II) d-酒石酸盐在 1,2-环氧环己烷与 1-丁硫醇、苯胺、和三甲基甲硅烷基叠氮化物分别以 85%、58% 和 42% ee 提供相应的加合物。此外,研究了由 Zn(II) d-酒石酸盐催化的具有硫醇的外消旋环氧乙烷的动力学拆分。
Rhodium-Catalyzed Allylic Alkylations as Key Steps in the Synthesis of Cyclic α-Alkylated Amino Acids
作者:Uli Kazmaier、Daniel Stolz
DOI:10.1055/s-2008-1078446
日期:2008.7
Sequential allylations of chelated enolates give rise to α,α-diallylated amino acids, which can be subjected to palladium-catalyzed cyclizations; bicyclic amino acids with a ketone functionality are formed under a carbon monoxide atmosphere by carbonylation.
Asymmetric Trasformation of Symmetrical Epoxides to Allylic Alcohols by Lithium (<i>S</i>)-2-(<i>N</i>,<i>N</i>-Disubstituted aminomethyl)pyrrolidide
作者:Masatoshi Asami
DOI:10.1246/bcsj.63.721
日期:1990.3
Enantioselective deprotonation of symmetrical epoxides was studied by using chiral lithium amide, prepared from (S)-2-(N,N-disubstituted aminomethyl)pyrrolidine and butyllithium. Chiral allylic alcohols were obtained with moderate to high enantiomeric excesses (ee’s) (41–92% ee) from several cyclic and acyclic epoxides employing lithium (S)-2-(1-pyrrolidinylmethyl)pyrrolidide in tetrahydrofuran (THF) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
Synthesis of 2-Substituted 2-Amino Ketones by Rhodium-Catalyzed Reaction of<i>N</i>-Sulfonyl-1,2,3-triazoles with 2-Alkenols
作者:Tomoya Miura、Takamasa Tanaka、Qiang Zhao、Scott G. Stewart、Masahiro Murakami
DOI:10.1002/hlca.201600320
日期:2017.2
A study on a rhodium(II)‐catalyzed reaction of N‐sulfonyl‐1,2,3‐triazoles with 2‐alkenols is reported. The reaction is initiated by insertion of an α‐imino carbene into the O–H linkage of alcohol, forming a 2‐alkenoxy enamide intermediate. A thermal [3,3]‐sigmatropicrearrangement follows to yield 2‐substituted 2‐amino ketone in a stereoselective manner. The successful application of this methodology