α‐Selective Ring‐Opening Reactions of Bicyclo[1.1.0]butyl Boronic Ester with Nucleophiles
作者:Lin Guo、Adam Noble、Varinder K. Aggarwal
DOI:10.1002/anie.202011739
日期:2021.1.4
The reaction of bicyclo[1.1.0]butyl pinacol boronic ester (BCB‐Bpin) with nucleophiles has been studied. Unlike BCBs bearing electron‐withdrawing groups, which react with nucleophiles at the β‐position, BCB‐Bpin reacts with a diverse set of heteroatom (O, S, N)‐centred nucleophiles exclusively at the α‐position. Aliphatic alcohols, phenols, carboxylic acids, thiols and sulfonamides were found to be
Lewis Acid Catalyzed Formal (3+2)‐Cycloaddition of Bicyclo[1.1.0]butanes with Ketenes
作者:Niklas Radhoff、Constantin G. Daniliuc、Armido Studer
DOI:10.1002/anie.202304771
日期:2023.8.21
efficient and transition-metal-free method for the preparation of valuable bicyclo[2.1.1]hexanes by Lewisacid catalyzed formal (3+2)-cycloaddition of readily available bicyclo[1.1.0]butanes and ketenes is presented. Excellent tolerance towards functional groups and versatile substitution patterns in the 3-position of the bicyclo[2.1.1]hexane core are demonstrated.