Ligand-Enabled C6-Selective C-H Arylation of Pyrrolo[2,3-d] Pyrimidine Derivatives with Pd Catalysts: An Approach to the Synthesis of EGFR Inhibitor AEE-788

Herein, we report the Pd(II)-catalyzed direct C-H arylation of pyrrolo[2,3-d]pyrimidine derivatives with aryl iodides, which is enabled by bidentate pyridine-pyridine ligands. A range of aryl iodides proved to be suitable coupling partners affording the desired products in good yields with high levels of C6 selectivity. This protocol features good tolerance of reactive functional groups, mild reaction conditions, and a simple reaction system, which provides an expeditious route to an essential class of 6-arylpyrrolo[2,3-d]pyrimidines frequently found in bioactive compounds, and provides a step-economical access to the second-generation EGFR inhibitor AEE-788.

Palladium-catalysed site-selective arene ortho C-H fluoroalkoxylation of 4-aryl-pyrrolo[2,3-d]pyrimidines

A palladium-catalysed direct arene C-H fluoroalkoxylation of 4-aryl-pyrrolo[2,3-d]pyrimidine derivatives with fluorinated alcohols is described. Highly site-selective mono- or bis-fluoroalkoxylation can be achieved by tuning the reaction conditions, affording various fluoroalkoxylated pyrrolo[2,3-d]pyrimidine derivatives in moderate to good yields, which offer rational tailoring of their biological activity for their application in the field of pharmaceutical chemistry.

Pd-Catalyzed highly selective and direct ortho C–H arylation of pyrrolo[2,3-d]pyrimidine derivatives

Pd-Catalyzed one-pot direct ortho C–H arylation of pyrrolo[2,3-d]pyrimidine derivatives is reported. This protocol provides a variety of biphenyl-containing pyrrolo[2,3-d]pyrimidines in good to excellent yields.

Transition-metal-free highly regioselective C–H acetoxylation of pyrrolo[2,3-d]pyrimidine derivatives

Transition-metal-free catalyzed direct C(sp²)–H acetoxylation of pyrrolo[2,3-d]pyrimidine derivatives is reported. This protocol provides a variety of acetoxylated pyrrolo[2,3-d]pyrimidines in good to excellent yields.

Regioselective C–H and N–H functionalization of purine derivatives and analogues: a synthetic and mechanistic perspective

This perspective provides a systematic and concise overview of the recent development in C–H/N–H bond functionalization in purine derivatives and analogues.