Quinazoline Synthesis via Rh(III)-Catalyzed Intermolecular C–H Functionalization of Benzimidates with Dioxazolones

Rh(III)-Catalyzed C-H Functionalization of Indolines with Readily Accessible Amidating Reagent: Synthesis and Anticancer Evaluation

The rhodium(III)-catalyzed direct C-H functionalization of various indolines with 1,4,2-dioxazol-5-ones as new amidating agents is described. This transformation provides efficient preparation of C7-amidated indolines known to display potent anticancer activity. The synthetic compounds were evaluated for in vitro anticancer activity against human prostate adenocarcinoma cells (LNCaP), human endometrial adenocarcinoma cells (Ishikawa), and human ovarian carcinoma cells (SKOV3). Compound 4f was found to be highly cytotoxic, with activity competitive with that of anticancer agent doxorubicin.

Recent developments in transition metal catalysis for quinazolinone synthesis

Quinazolinones are an important class of heteroaromatic compound, and they are prevalent in a variety of important bio-active scaffolds. Traditionally, their synthesis has been achieved via classical condensation procedures, however over recent years catalytic methodologies have emerged as effective alternatives. This review examines recent developments in the employment of catalytic approaches towards this highly important heterocyclic motif.

Synthesis of isoquinolines via Rh-catalyzed C–H activation/C–N cyclization with diazodiesters or diazoketoesters as a C2 source

Synthesis of isoquinolines based on efficient C–C and C–N bond formation through Rh(iii)-catalyzed C–H functionalization and subsequent intramolecular cyclization is reported. Diazodiesters serving as a C₂ source in the newly formed heterocycles are first demonstrated.

Ir(iii)-catalyzed synthesis of isoquinolines from benzimidates and α-diazocarbonyl compounds

We report herein a tandem Ir(iii)-catalyzed C–H activation and annulation reactions for the synthesis of isoquinolines. This novel method affords an alternative strategy for the construction of diverse and useful isoquinoline derivatives.