Synthesis and reactivity of 4-oxo-5-trimethylsilanyl derived α-amino acids

One-pot synthesis of N-substituted benzannulated triazoles via stable arene diazonium salts

A mild and effective one-pot synthesis of 1,2,3-benzotriazin-4(3H)-ones and benzothiatriazine-1,1(2H)-dioxide analogues has been developed. The method involves the diazotisation and subsequent cyclisation of 2-aminobenzamides and 2-aminobenzenesulfonamides via stable diazonium salts, prepared using a polymer-supported nitrite reagent and p-tosic acid. The transformation was compatible with a wide range of aryl functional groups and amide/sulfonamide-substituents and was used for the synthesis of pharmaceutically important targets. The synthetic utility of the one-pot diazotisaton-cyclisation process was further demonstrated with the preparation of an α-amino acid containing 1,2,3-benzotriazin-4(3H)-one.

Ruthenium catalyzed remote C4-selective C–H functionalisation of carbazoles via σ-activation

We report the C4-selective C–H alkylation of carbazole derivatives furnished with a pyrimidine directing group at C1.

Synthesis of pyrazole containing α-amino acids via a highly regioselective condensation/aza-Michael reaction of β-aryl α,β-unsaturated ketones

A new class of α-amino acid incorporating 5-aryl pyrazole units have been prepared using a highly regioselective condensation/aza-Michael reaction of β-aryl α,β-unsaturated ketones.