Iridium-Catalyzed Enantioselective Allylic Substitution with Aqueous Solutions of Nucleophiles
作者:Tobias Sandmeier、F. Wieland Goetzke、Simon Krautwald、Erick M. Carreira
DOI:10.1021/jacs.9b05830
日期:2019.8.7
The iridium-catalyzed asymmetric allylic substitution under biphasic conditions is reported. This approach allows the use of various unstable and/or volatile nucleophiles including hydrazines, methyl-amine, t-butyl hydroperoxide, N-hydroxylamine, α-chloroacetaldehyde and glutaraldehyde. This transformation pro-vides rapid access to a broad range of products from simple starting materials in good yields
报道了双相条件下铱催化的不对称烯丙基取代。这种方法允许使用各种不稳定和/或挥发性亲核试剂,包括肼、甲胺、叔丁基过氧化氢、N-羟胺、α-氯乙醛和戊二醛。这种转变提供了从简单的起始材料以良好的产率和高达 > 99% ee 和 20:1 dr 快速获得广泛产品的途径。此外,这些产品可以有效地加工成多种环状和非环状化合物,最多可带有四个立体中心。
Enantio- and Diastereodivergent Dual Catalysis: α-Allylation of Branched Aldehydes
作者:Simon Krautwald、David Sarlah、Michael A. Schafroth、Erick M. Carreira
DOI:10.1126/science.1237068
日期:2013.5.31
stereocenters in a carbon–carbon bond-forming reaction. [Also see Perspective by Schindler and Jacobsen] An important challenge in asymmetricsynthesis is the development of fully stereodivergent strategies to access the full complement of stereoisomers of products bearingmultiple stereocenters. In the ideal case, where four products are possible, applying distinct catalysts to the same set of starting materials
Regio- and Enantioselective Rhodium-Catalyzed Allylic Alkylation of Racemic Allylic Alcohols with 1,3-Diketones
作者:Sheng-Biao Tang、Xiao Zhang、Hang-Fei Tu、Shu-Li You
DOI:10.1021/jacs.8b05126
日期:2018.6.20
Highly regio- and enantioselective rhodium-catalyzed allylicalkylation of 1,3-diketones with racemic secondary allylic alcohols is reported. In the presence of a Rh-catalyst derived from the Carreira (P, olefin)-ligand and TFA as an additive, chiral branched α-allylated 1,3-diketones could be obtained in good to excellent yields, with excellent regio- and enantioselectivity ( b/ l > 19/1, 86-98% ee)
Chiral Cyclic Ligand-Enabled Iridium-Catalyzed Asymmetric Arylation of Unactivated Racemic Allylic Alcohols with Anilines
作者:Hua Tian、Pengxiang Zhang、Fei Peng、Haijun Yang、Hua Fu
DOI:10.1021/acs.orglett.7b01631
日期:2017.7.21
unactivated racemic secondary allylicalcohols with aniline derivatives has been developed. The transformation was enabled by an iridium–chiral cyclic phosphoramidite complex in the presence of boron trifluoride diethyl etherate as the promoter, and the reactivity and enantioselectivity of the substrates were tuned by the variation of our newly developed chiral cyclic phosphoramidite ligands together
作者:James Y. Hamilton、Nicole Hauser、David Sarlah、Erick M. Carreira
DOI:10.1002/anie.201406077
日期:2014.9.26
enantioselective allyl–allylsilane cross‐coupling involving racemic branched allylic alcohols and allylsilanes is reported. An iridium‐(P,olefin) phosphoramidite complex enables the transformation with high regio‐ and stereoselectivity under operationally simple conditions. The utility of the coupling is demonstrated in a concise catalytic, enantioselective synthesis of a pyrethroid insecticide protrifenbute