A protocol for the synthesis of C5-olefinated 2-arylchromanones in a regio- and stereoselective fashion through the ruthenium-catalyzed oxidative coupling of diversified 2-arylchromanones with various alkenes through a keto-directed, site-selective C–Hactivation reaction is developed. IBO = isobornyl.
Asymmetric Intramolecular Oxa-Michael Addition of Activated α,β-Unsaturated Ketones Catalyzed by a Chiral<i>N</i>,<i>N</i>′-Dioxide Nickel(II) Complex: Highly Enantioselective Synthesis of Flavanones
Direct α-Arylation/Heteroarylation of 2-Trifluoroboratochromanones via Photoredox/Nickel Dual Catalysis
作者:Jennifer K. Matsui、Gary A. Molander
DOI:10.1021/acs.orglett.6b03448
日期:2017.2.3
Utilizing photoredox/nickel dual catalysis, diverse flavanones have been synthesized by coupling novel 2-trifluoroboratochromanone building blocks with aryl and heteroaryl bromide partners. The newly reported trifluoroborato-chromanones can be easily accessed from the corresponding chromones on multigram scale. This represents a general route for accessing natural and unnatural flavanones that were previously formed through a synthetically more restrictive ring closure route from chalcone precursors.
Facile Synthesis of Tetrazolylchromonoids and Related Compounds
作者:Tamás Patonay、Albert Lévai
DOI:10.1002/ardp.19943270310
日期:——
The reaction between the appropriate nitriles and tributyltin azide (TBTA) provides an easy and efficient method for the synthesis of the title compounds. Treatment of thiocyanate 9b with TBTA affords the alkylthio‐substituted tetrazole 10b.