New conditions for dearomatizingsamarium‐ketyl (hetero)arene cyclizations are reported. In many examples of these samariumdiiodide‐mediated reactions, lithium bromide and water can be used as additives instead of the carcinogenic and mutagenic hexamethylphosphoramide (HMPA). The best results were obtained for the cyclizations of N‐acylatedindolederivatives delivering the expected indolines in good
Highly diastereoselective samarium diiodide induced cyclizations of new 3-substituted indole derivatives
作者:Christine Beemelmanns、Hans-Ulrich Reissig
DOI:10.1039/b913015b
日期:——
Herein, we describe the synthesis of new functionalized tricyclic and tetracyclic indole derivatives viasamarium diiodide induced ketyl cyclizations. The intermediate samarium organyls were either protonated using different proton sources or alkylated with various electrophiles in a highly diastereoselective manner. The obtained products were subjected to further transformations leading to synthetically interesting building blocks.