Rh(III)-Catalyzed Enaminone-Directed C–H Coupling with α-Diazo-α-phosphonoacetate for Reactivity Discovery: Fluoride-Mediated Dephosphonation for C–C Coupling Reactions
Rh(III)-catalyzed enaminone-directed C–H coupling with α-diazo-α-phosphonoacetate has been used for the identification of fluoride-mediated dephosphonation C–C coupling reactivity for the synthesis of 4-hydroxy-1-naphthoates. Intermolecular C–C coupling of α-phosphonoacetate and benzaldehyde for (E)-selective α,β-unsaturated ester synthesis has also been achieved.
A rhodium(III)-catalyzed sulfonamide directed ortho C–H carbenoid functionalization has been developed with good yields. This method is attractive due to its broad substrate scope, and enables derivation of diverse biologically active sulfonamide structures and late-stage modification of sulfa drugs.
The limitations of arene C–H functionalization of aryl sulfonamides containing stronglycoordinatingN-heterocycles were overcome using a Rh(III) catalyst. The site-selectivity of C–H carbenoid functionalization at the ortho position relative to either the sulfonamide or N-heterocycle directing groups was elegantly switched using solvents of different polarities and different additive concentrations
A C–H activation-based strategy has been developed for the synthesis of N-amino azaheterocycles. Rh(III)-catalyzed coupling of N-Boc hydrazones/N-Boc hydrazines with diazodiesters/diazoketoesters provides convenient access to synthetically and medicinally important compounds, N-amino isoquinolin-3-ones and N-amino indoles, by harnessing N-tert-butyloxycarbonyl (N-Boc) cleavage as an adaptable reactivity
Three Efficient Methods for Preparation of Coelenterazine Analogues
作者:Anton Shakhmin、Mary P. Hall、Joel R. Walker、Thomas Machleidt、Brock F. Binkowski、Keith V. Wood、Thomas A. Kirkland
DOI:10.1002/chem.201601111
日期:2016.7.18
growing popularity of bioluminescent assays has highlighted the need for coelenterazine analogues possessing properties tuned for specific applications. However, the structural diversity of known coelenterazine analogues has been limited by current syntheses. Known routes for the preparation of coelenterazine analogues employ harsh reaction conditions that limit access to many substituents and functional