Base-mediated benzannulation of α-cyanocrotonates with ynones: facile synthesis of benzonitriles and fluorenes
作者:Maneesh Kumar Reddy Singam、Attunuri Nagireddy、Sridhar Reddy Maddi
DOI:10.1039/d0gc00608d
日期:——
Benzonitriles and cyanofluorenes have been rapidly obtained via the [3 + 3] benzannulation of readily available alkynones and α-cyanocrotonates using KOtBu as the only reagent and EtOH (and CO2) is the only by-product.
(Planar‐Chiral) Ferrocenylmethanols: From Anionic Homo Phospho‐Fries Rearrangements to α‐Ferrocenyl Carbenium Ions
作者:Marcus Korb、Julia Mahrholdt、Heinrich Lang
DOI:10.1002/ejic.201700645
日期:2017.9.15
chlorophosphates gave ferrocenyl phosphates FcCH2OP(O)(OR)2 (Fc = Fe(η5-C5H5)(η4-C5H4)), which readily separate into phosphate anions and ferrocenyl carbo-cations. The latter species undergoes consecutive reactions, e. g. electrophilic aromatic substitutions. When nitriles, instead of alcohols, are treated with FcLi or tBuLi and chlorophosphates, chiral-pool based ferrocenyl imino phosphoramidates
N-Heterocyclic Carbene-Catalyzed Synthesis of Multi-Substituted Benzenes from Enals and α-Cyano-β-methylenones
作者:Chun-Lin Zhang、Zhong-Hua Gao、Zhi-Qin Liang、Song Ye
DOI:10.1002/adsc.201600531
日期:2016.9.15
An oxidative NHC‐catalyzed [2+4] annulation of enals and α‐cyano‐β‐methylenones was established for the rapid assembly of multi‐substituted benzenes.
建立了氧化型NHC催化的[2 + 4]环烯和α-氰基-β-甲基烯酮环化反应,以快速组装多取代的苯。
Transnitrilation from Dimethylmalononitrile to Aryl Grignard and Lithium Reagents: A Practical Method for Aryl Nitrile Synthesis
作者:Jonathan T. Reeves、Christian A. Malapit、Frederic G. Buono、Kanwar P. Sidhu、Maurice A. Marsini、C. Avery Sader、Keith R. Fandrick、Carl A. Busacca、Chris H. Senanayake
DOI:10.1021/jacs.5b06136
日期:2015.7.29
An electrophilic cyanation of aryl Grignard or lithium reagents, generated in situ from the corresponding aryl bromides or iodides, by a transnitrilation with dimethylmalononitrile (DMMN) was developed. DMMN is a commercially available, bench-stable solid. The transnitrilation with DMMN avoids the use of toxic reagents and transition metals and occurs under mild reaction conditions, even for extremely
The benzonitrile unit is widely found in natural products, pharmaceuticals, and agrochemicals. Synthesis of benzonitriles has received considerable interests from the chemical community over the last few decades. Present synthetic protocols mainly rely on the pre-existing benzene core to install a cyano moiety. A new NHC-catalyzed [4 + 2]-benzannulation protocol is reported to assemble the benzonitrile