photoinduced acylation of N‐heterocycles is explored. This visible‐lighttriggered reaction occurs not only under extremely mild reaction conditions, but also does not require the presence of a photosensitizer. The mechanistic studies suggest formation of EDA complexes prompt to harness the energy from visible‐light. Compatibility with a large panel of α‐keto acids as acyl precursors and an array of N‐heterocycles
Photo-redox catalyzed dehydrazinative acylation of N-heterocycles <i>via</i> Minisci reaction
作者:Saira Hafeez、Aamer Saeed
DOI:10.1039/d1ra07063k
日期:——
achieved using benzoyl hydrazides as an efficient acyl source undermild reaction conditions. The photo-redox catalyzed oxidative cleavage of hydrazides leads to in situ formation of acyl radicals, which subsequently couple with various N-heterocycles to produce acylated products. This synthetic strategy performs the classic Minisci reaction in an eco-friendly and greener way with functional group tolerance
In the reaction of 1-substituted phthalazines with ynamines, there are three patterns of ring transformation, giving naphthalene derivatives through addition-cyclization-denitrogenation (type A), giving benzodiazocine derivatives through addition-cyclization-ring expansion (type B), and giving penta-substituted pyridine derivatives through N-N bond cleavage of the pyridazine ring (type C). In these reactions, it is considered that the substituent group at the 1-position of the phthalazine ring is a significant factor determining the outcome.