Ligand-Controlled Palladium-Catalyzed Regiodivergent Suzuki–Miyaura Cross-Coupling of Allylboronates and Aryl Halides
摘要:
An orthogonal set of catalyst systems has been developed for the Suzuki-Miyaura coupling of 3,3-disubstituted and 3-monosubstituted allylboronates with (hetero)aryl halides. These methods allow for the highly selective preparation of either the alpha- or the gamma-isomeric coupling product.
Palladium-Catalyzed Completely Linear-Selective Negishi Cross-Coupling of Allylzinc Halides with Aryl and Vinyl Electrophiles
作者:Yang Yang、Thomas J. L. Mustard、Paul Ha-Yeon Cheong、Stephen L. Buchwald
DOI:10.1002/anie.201308585
日期:2013.12.23
Completely linear: The title reaction provides an effective means to access a wide range of prenylated arenes and “skipped dienes” in a completely linear‐selective fashion, as demonstrated by a concise synthesis of the anti‐HIV natural product siamenol. DFT calculations shed light on the origin of the excellent regioselectivity observed with the current Pd‐based catalyst system.
完全线性:标题反应提供了一种有效的方法,可以以完全线性选择性的方式获得广泛的异戊二烯化芳烃和“跳过的二烯”,如抗 HIV 天然产物 siamenol 的简明合成所证明的那样。DFT 计算揭示了当前 Pd 基催化剂体系观察到的优异区域选择性的起源。
Regioselective Cross-Coupling of Allylboronic Acid Pinacol Ester Derivatives with Aryl Halides via <i>Pd-PEPPSI-IPent</i>
作者:Jennifer L. Farmer、Howard N. Hunter、Michael G. Organ
DOI:10.1021/ja308613b
日期:2012.10.24
The cross-coupling reactions of allylboronic acid pinacol ester derivatives with aryl and heteroaryl halides occurred with high selectivity (>97%) at the α-carbon of the allylboron reagent in the presence of Pd-PEPPSI-IPent precatalyst and 5 M KOH in refluxing THF. In the case of trisubstituted allylboronates with different substituents on the olefin, minor olefin geometry isomerization was observed
A metal‐free dehydrogenative Diels‐Alderreaction of substituted alkenes for the synthesis of tetrahydroisoindolinones has been exploited for the first time. This new method features functional group tolerance and broad substrate scope, providing an efficient access to biologically active tetrahydroisoindolinone skeletons with endo steroselectivity in good to excellent yields.