已显示强硼路易斯酸三(五氟苯基)硼烷B(C 6 F 5)3从适当的供体取代的环己-1,4-二烯中提取氢化物,最终释放出二氢。该过程与亚胺和含氮杂芳基的FLP型氢化(FLP =失意的Lewis对)加氢反应相同的Lewis酸催化。最终反应是使用易于获得的环己-1,4-二烯作为还原剂,经B(C 6 F 5)3催化,即无过渡金属转移氢化。讨论了有或没有游离二氢参与的竞争反应途径。
Pd-catalyzed addition of arylboronic acids to N-tosylarylimines was described by employing easily prepared, air-stable aminophosphine ligands, cheap inorganic base, and common organic solvents, providing diarylmethylamine derivatives through one-pot synthesis in moderate to good yields. The efficiency of this reaction was demonstrated by the compatibility with nitro, trifluoromethyl, fluoro, chloro, and methoxy groups. Moreover, rigorous exclusion of air/moisture is not required in these transformations.
Lewis Acid-Catalyzed CH Functionalization for Synthesis of Isoindolinones and Isoindolines
作者:Bo Qian、Shengmei Guo、Chungu Xia、Hanmin Huang
DOI:10.1002/adsc.201000556
日期:2010.12.17
The Lewisacid-catalyzed CH functionalization of 2-substituted azaarenes with N-sulfonylaldimines has been developed, which provides a rapid and efficient approach for synthesis of heterocycle-containing isoindolinones and isoindolines.
[reaction: see text] A dimethylzinc-air initiator was applied to the generation of primary alkylradicals from alkyl iodides. The addition of the generated primary alkylradicals to N-tosylimines was accelerated by the action of boron trifluoride-diethyl etherate and copper(II) triflate to give the corresponding adducts in good yields after 2-3 h. Air oxygen was essential for the reaction to proceed
A three-componentcouplingreaction of arynes, isocyanides and N-tosylaldimines has been developed to offer modest to high yields of diverse 2-iminoisoindolines in one step. Intermediacy of arynes in the coupling has been verified by the reaction of unsymmetrical arynes.
Enantioselective Addition of Silicon Nucleophiles to Aldimines Using a Preformed NHC-Copper(I) Complex as the Catalyst
作者:Alexander Hensel、Kazuhiko Nagura、Lukas B. Delvos、Martin Oestreich
DOI:10.1002/anie.201402086
日期:2014.5.5
asymmetric addition of siliconnucleophiles to typical prochiral acceptors, the enantioselective 1,2‐addition to aldimines, is addressed. Activation of the SiB bond in the silicon pronucleophile by a copper(I) alkoxide with McQuade’s chiral six‐membered N‐heterocyclic carbene as a supporting ligand releases the siliconnucleophile, which adds to various aldimines with high levels of enantioselectivity. The