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.
A phosphine-free heterogeneous coupling of acyl chlorides with terminal alkynes catalyzed by an MCM-41-immobilized palladium complex
作者:Bin Huang、Lin Yin、Mingzhong Cai
DOI:10.1039/c3nj00425b
日期:——
The phosphine-free heterogeneous coupling of acyl chlorides with terminalalkynes was achieved in triethylamine at 50 °C in the presence of a 0.2 mol% 3-(2-aminoethylamino)propyl-functionalized MCM-41-immobilized palladium complex [MCM-41-2N-Pd(OAc)2], yielding a variety of ynones in good to excellent yields. This novel heterogeneous palladiumcatalyst can be conveniently prepared from commercially
Difunctionalization of Alkynones by Base-Mediated Reaction with α,α-Dithioketones
作者:Yajie Yang、Lu Cheng、Mengdan Wang、Liqiang Yin、Ye Feng、Chengyu Wang、Yanzhong Li
DOI:10.1021/acs.orglett.1c01640
日期:2021.7.16
strategy for the synthesis of tetrasubstituted olefins has been developed. This procedure is realized by a formal C–C σ-bond cleavage reaction of cyclic α,α-dithioketones and subsequent deprotection. Notable features of this approach include excellent yields, mild reaction conditions, a broad substrate scope, and operational simplicity.
This invention relates to 1-phenyl-3-aryl-2-propyne-1-ones, the use of these compounds as calcium uptake inhibitors in leukocytes and thrombocytes, and pharmaceutical compositions containing these compounds as active ingredients, and the process of their preparation.
NHC-Catalyzed Formal [4 + 2] Annulation of <i>o</i>-Formyl-Tethered Michael Acceptors and Ynones to Access Highly Functionalized Naphthalene Derivatives
Herein we demonstrate a novel organocatalytic method to access multifunctionalized naphthalenes via an NHC-catalyzed reaction of ynones and o-formyl-tethered Michael acceptors. The presented method proceeds through an intermolecular Stetter reaction–cyclization–aromatization cascade and represents a rare example of organocatalytic benzannulation for the synthesis of substituted arenes by using ynone