Synthesis of substituted α-methylene-γ-butyrolactones from chloroformates via palladium catalysed cyclisation–anion capture
作者:Ronald Grigg、Vladimir Savic
DOI:10.1039/b006842j
日期:——
Cyclisation of chloroformates onto proximate alkyne
functionality in the presence of a Pd(0) catalyst followed by
anion capture affords α-methylene-γ-butyrolactone derivatives
in moderate to good yields.
Reported herein is the design of a photosensitization strategy to generate triplet nitrenes and its applicability for the intramolecular C-H amidation reactions. Substrate optimization by tuning physical organic parameters according to the proposed energytransfer pathway led us to identify hydroxamates as a convenient nitrene precursor. While more classical nitrene sources, representatively organic