A very mild, efficient and green method has been developed for diazo transfer to a range of β-ketoesters using polystyrene-supported benzenesulfonyl azide, water as solvent and a catalytic amount of base. This methodology eliminates the need for a standard work up and purification which is usually required to remove the sulfonamide by-product from the reaction.
E. Tarrant, C. V. O'Brien and S. G. Collins, RSC Adv., 2016, 6, 31202 DOI: 10.1039/C6RA03678C
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