Stereoselective Ketone Rearrangements with Hypervalent Iodine Reagents
作者:Florence Malmedy、Thomas Wirth
DOI:10.1002/chem.201603022
日期:2016.11.2
The first stereoselective version of an iodine(III)‐mediated rearrangement of arylketones in the presence of orthoesters is described. The reaction products, α‐arylated esters, are very useful intermediates in the synthesis of bioactive compounds such as ibuprofen. With chiral lactic acid‐based iodine(III) reagents product selectivities of up to 73 % ee have been achieved.
Published as part of the 50 Years SYNTHESIS – Golden Anniversary Issue Abstract The chelation-control model is used to predict stereochemical outcomes of many organometallic reactions. Diastereoselectivity arises due to reaction with a chelated intermediate with sterically differentiated faces. Earlier studies with dimethylmagnesium established that the chelated intermediate is a minor component of