Ring Enlargement of Three‐Membered Heterocycles by Treatment with In Situ Formed Tricyanomethane
作者:Klaus Banert、Madhu Chityala、Marcus Korb
DOI:10.1002/chem.202000089
日期:2020.5.15
expansion with formation of 2-(dicyanomethylidene)oxazolidine derivatives or creation of the corresponding thiazolidine, imidazolidine, or imidazoline compounds and opens up a new access to these push-pull-substituted olefinic products. The regio- and stereochemistry of the ring-enlargement processes are discussed, and the proposed reaction mechanisms were confirmed by using 15 N-labeled substrates. It