The First Ring-Enlargement of a 1-Azabicyclo[1.1.0]butane to a 1-Azabicyclo[2.1.1]hexane
作者:Grzegorz Mlostoń、Heinz Heimgartner
DOI:10.1002/hlca.200690044
日期:2006.3
The reactions of 3-phenyl-1-azabicyclo[1.1.0]butane (4) with dimethyl dicyanofumarate ((E)-8) and dimethyl dicyanomaleate ((Z)-8) lead to the same mixture of cis- and trans-4-phenyl-1-azabicyclo[2.1.1]hexane 2,3-dicarboxylates (cis-11 and trans-11, resp.; Scheme 3). This result of a formal cycloaddition to the central CN bond of 4 is interpreted by a stepwise reactionmechanism via a relatively stable