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‐Heterocyclic‐Carbene‐Coordinated Palladium Catalysts for 1,2‐Addition of Arylboron Compounds to Carbonyl Compounds
作者:Yuta Okuda、Masahiro Nagaoka、Tetsuya Yamamoto
DOI:10.1002/cctc.202001464
日期:2020.12.16
primary, secondary, and tertiary alcohols by the 1,2‐addition of arylboronic acids or boronates to carbonyl compounds, including unactivated ketones, using novel bulky yet flexible N‐heterocyclic carbene (NHC)‐coordinated 2,6‐di(pentan‐3‐yl)aniline (IPent)‐based cyclometallated palladium complexes (CYPs) as catalysts is reported. The PhS‐IPent‐CYP‐catalyzed reactions are efficient at low catalyst loadings
作者:Barry R. Steele、Spyros Georgakopoulos、Maria Micha-Screttas、Constantinos G. Screttas
DOI:10.1002/ejoc.200700233
日期:2007.7
molecules containing sterically demandingalkyl groups feature in a number of important areas ofchemistry, such as homogeneous catalysis, materials chemis-try, medicinal chemistry, unsaturated and low-coordinationcompounds of the heavier main group elements. Of the vari-ous classes of aromatic compounds, the 2,6-dialkylanilinesfeature widely as starting materials for the synthesis ofSchiff bases, N-heterocyclic
Enantioselective Hydroarylation or Hydroalkenylation of Benzo[<i>b</i>]thiophene 1,1-Dioxides with Organoboranes
作者:Fangdong Hu、Jie Jia、Ximing Li、Ying Xia
DOI:10.1021/acs.orglett.0c04114
日期:2021.2.5
protocol for the asymmetric hydroarylation and hydroalkenylation of benzo[b]thiophene 1,1-dioxides with organoboranes has been developed. The combination of a rhodium(I) precatalyst and a chiral diene ligand constitutes the catalytic system, which enables the facile synthesis of 2,3-dihydrobenzo[b]thiophene 1,1-dioxides in good yields with high enantioselectivities. The merging of this asymmetric hydroarylation
已开发出一种有效的方案,用于有机硼烷对苯并[ b ]噻吩1,1-二氧化物的不对称加氢芳基化和加氢烯基化反应。铑(I)预催化剂和手性二烯配体的组合构成了催化体系,该体系能够以高收率和高对映选择性轻松合成2,3-二氢苯并[ b ]噻吩1,1-二氧化物。该不对称氢芳基化与下游烷基化的合并以非对映异构的方式提供了包含两个具有高对映选择性的连续的季立体中心的2,3-二氢苯并[ b ]噻吩1,1-二氧化物。
Murahashi Cross‐Coupling at −78 °C: A One‐Pot Procedure for Sequential C−C/C−C, C−C/C−N, and C−C/C−S Cross‐Coupling of Bromo‐Chloro‐Arenes
作者:Narayan Sinha、Dorus Heijnen、Ben L. Feringa、Michael G. Organ
DOI:10.1002/chem.201901678
日期:2019.7.11
The coupling of organolithium reagents, including strongly hindered examples, at cryogenic temperatures (as low as −78 °C) has been achieved with high‐reactivity Pd‐NHC catalysts. A temperature‐dependent chemoselectivity trigger has been developed for the selective coupling of arylbromides in the presence of chlorides. Building on this, a one‐pot, sequential coupling strategy is presented for the
Sterically demanding imidazolinium salts through the activation and cyclization of formamides
作者:Michael Tsimerman、Debasis Mallik、Tsukasa Matsuo、Takashi Otani、Kohei Tamao、Michael G. Organ
DOI:10.1039/c2cc36329a
日期:——
A new protocol was developed for the synthesis of sterically demanding imidazolinium salts. This procedure was adopted for the synthesis of seven NHC salts, including ones that were demonstrated to be inaccessible using the conventional orthoformate ester type cyclization method.