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Metal-free, hydroacylation of CC and NN bonds via aerobic C–H activation of aldehydes, and reaction of the products thereof†
Vijay Chudasama,Ahmed R. Akhbar,Karim A. Bahou,Richard J. Fitzmaurice,Stephen Caddick
Organic & Biomolecular Chemistry Pub Date : 09/17/2013 00:00:00 , DOI:10.1039/C3OB41632A
Abstract

In this report, a thorough evaluation of the use of aerobically initiated, metal-free hydroacylation of various C[double bond, length as m-dash]C and N[double bond, length as m-dash]N acceptor molecules with a wide range of aldehydes is presented. The aerobic-activation conditions that have been developed are in sharp contrast to previous conditions for hydroacylation, which tend to use transition metals, peroxides that require thermal or photochemical degradation, or N-heterocyclic carbenes. The mildness of the conditions enables a number of reactions involving sensitive reaction partners and, perhaps most significantly, allows for α-functionalised chiral aldehydes to undergo radical-based hydroacylation with complete retention of optical purity. We also demonstrate how the resulting hydroacylation products can be transformed into other useful intermediates, such as γ-keto-sulfonamides, sultams, sultones, cyclic N-sulfonyl imines and amides.

Graphical abstract: Metal-free, hydroacylation of C [[double bond, length as m-dash]] C and N [[double bond, length as m-dash]] N bonds via aerobic C–H activation of aldehydes, and reaction of the products thereof
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