10.1021/ol403035g.s002 Ryan A. Brawn Ryan A. Brawn Kaicheng Zhu Kaicheng Zhu James S. Panek James S. Panek Rhodium(II)-Catalyzed Alkyne Amination of Homopropargylic Sulfamate Esters: Stereoselective Synthesis of Functionalized Norcaradienes by Arene Cyclopropanation American Chemical Society 2014 homopropargylic ether Norcaradiene Rhodium nucleophilic ring opening cyclic sulfamate ester cycloaddition Amination electrocyclization rhodium Synthesi Arene Buchner arene cyclopropanation Alkyne Homopropargylic Sulfamate Esters Functionalized Stereoselective tetracyclic norcaradiene products nitrene cycloheptatriene stereochemically CyclopropanationA 2014-01-03 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Rhodium_II_Catalyzed_Alkyne_Amination_of_Homopropargylic_Sulfamate_Esters_Stereoselective_Synthesis_of_Functionalized_Norcaradienes_by_Arene_Cyclopropanation/2336419 A rhodium­(II) catalyzed nitrene–alkyne cycloaddition of stereochemically well-defined homopropargylic ethers is followed by arene cyclopropanation to afford unique tetracyclic norcaradiene products bearing a cyclic sulfamate. Products from the arene cyclopropanation (Buchner reaction) can be converted to fused cycloheptatrienes via a ring enlarging electrocyclization after nucleophilic ring opening of the cyclic sulfamate ester.