Palladium-Catalyzed Ring-Closing Reaction via C–N Bond Metathesis for Rapid Construction of Saturated <i>N</i>-Heterocycles
作者:Bangkui Yu、Suchen Zou、Hongchi Liu、Hanmin Huang
DOI:10.1021/jacs.0c10615
日期:2020.10.28
The ring-closingreactions based on chemical bond metathesis enable the efficient construction of a wide variety of cyclic systems which receive broad interest from medicinal and organic communities. However, the analogous reaction with C-N bond metathesis as a strategic fundamental step remains an unanswered challenge. Herein, we report the design of a new fundamental metallic C-N bond metathesis reaction
Pd(II)-Catalyzed Intramolecular 1,2-Aminoalkylation of Conjugated 1,3-Dienes for the Synthesis of Pyrrolizidines
作者:Dong Xing、Dan Yang
DOI:10.1021/ol401901h
日期:2013.9.6
A palladium(II)-catalyzed tandem cyclization reaction involving an intramolecular 1,2-aminoalkylation of N-4,6-dienyl β-keto amides has been developed. This process provides an efficient method for the rapid assembly of pyrrolizidines starting from linear substrates in moderate to good yields and high to excellent diastereoselectivities.
Regio- and Enantioselective Hydroamination of Dienes by Gold(I)/Menthol Cooperative Catalysis
作者:Osamu Kanno、Wataru Kuriyama、Z. Jane Wang、F. Dean Toste
DOI:10.1002/anie.201104076
日期:2011.10.10
Alcohol is key: Regio‐ and enantioselectivehydroamination of 1,3‐dienes has been achieved with the dinuclear catalyst (R)‐DTBM‐SEGPHOS. The rate and selectivity of the reaction are enhanced by alcohol additives like menthol, which coordinates the cationic gold(I) to generate a Brønsted acid that can participate in catalysis. Mbs=p‐methoxybenzenesulfonyl.
醇是关键:已使用双核催化剂 ( R )-DTBM-SEGPHOS实现了 1,3-二烯的区域选择性和对映选择性加氢胺化。醇类添加剂如薄荷醇可提高反应的速率和选择性,薄荷醇与阳离子金 (I) 配位以生成可参与催化的布朗斯台德酸。Mbs=对甲氧基苯磺酰基。
Copper-mediated intramolecular aminofluorination of 1,3-dienes by using nucleophilic fluorine reagents
作者:Zuxiao Zhang、Pinhong Chen、Guosheng Liu
DOI:10.1039/c8cc04909b
日期:——
A copper-mediated intramolecular aminofluorination of 1,3-dienes is disclosed, in which both AgF and Et3N·3HF can be used as the fluorine source. This protocol provides a variety of pyrrolidines bearing allylic fluorides with excellent regioselectivities and good diastereoselectivities.