Annulation of β-Enaminonitriles with Alkynes via Rh<sup>III</sup>-Catalyzed C–H Activation: Direct Access to Highly Substituted 1-Naphthylamines and Naphtho[1,8-<i>bc</i>]pyridines
作者:Haili Wang、Hong Xu、Bin Li、Baiquan Wang
DOI:10.1021/acs.orglett.8b02341
日期:2018.9.21
A Cp*RhIII-catalyzed oxidative annulation of β-enaminonitriles with alkynes was reported to achieve selective synthesis of polysubstituted 1-naphthylamines and naphtho[1,8-bc]pyridines via multiple C–Hactivations. Assisted by a naphthylamine NH2 group, 1-naphthylamines were also readily cyclized to produce naphtho[1,8-bc]pyridines. In addition, the obtained naphtho[1,8-bc]pyridine derivatives exhibit
据报道,Cp * Rh III催化的炔烃对β-烯腈的氧化环化反应通过多种C-H活化选择性地合成了多取代的1-萘胺和萘[1,8- bc ]吡啶。在萘胺NH 2基团的辅助下,1-萘胺也很容易被环化以生成萘[1,8- bc ]吡啶。此外,所获得的萘并[1,8- bc ]吡啶衍生物在固态下表现出强烈的荧光。
FeCl3-Promoted Facile Synthesis of Multiply Arylated Nicotinonitriles
Many biologically active nicotinonitriles have been reported to date. Consequently, the development of synthetic methods for multiply arylated/alkylated nicotinonitriles remains a sought-after field of research. In the present work, a new synthetic strategy for multi-substituted nicotinonitriles is described. A FeCl3-promoted condensation–cyclization reaction of an enamino nitrile and α,β-unsaturated
Trisubstituted thiazoles by a 6π-electrocyclization of iminothiocarbonyl ylides
作者:A. Corsaro、M. Tarantello、G. Purrello
DOI:10.1016/s0040-4039(01)81891-8
日期:1981.1
Iminothiocarbonyl ylides are generated by a sulfur ligand exchange reaction of sulfoniumsalts and undergo a 6π-electrocyclic closure and aromatization to trisubstituted thiazoles. Related carbonyl ylides preferred a 4π-electrocyclization.
It takes two to TangPhos: β‐Amino acrylonitriles can be readily prepared from acetonitriles. Both of the E/Z isomers undergo hydrogenation with excellent enantioselectivity by using the Rh–TangPhos (TangPhos=1,1′‐di‐tert‐butyl‐(2,2′)‐diphospholane) catalyst system. The products, chiral β‐amino nitriles, are valuable chiral building blocks for many drugs.
with β-amino-β-arylacrylonitrile 2, readily available from acetonitrile with aryl nitriles in the presence of potassium t-butoxide, to afford the corresponding 2,6-diaryl-3-cyano-4-(trifluoromethyl)pyridines 3 in moderate to excellent yields.