A Stereoselective and Regioselective
Synthesis of <i>trans</i>,<i>trans</i>-Configured 1,2,3-Trisubstituted
Indanes: Cycloaddition of Alkenes with Iodonium Ylides of β-Disulfones<b />
l) methylides α-γ with alkenes 1 affords the multiply trisubstituted indanes 2 in moderate to good yields, through an unusual cycloaddition. The present stereoselective and regioselective cycloaddition provides a convenient preparative route to trans,trans-configured 1,2,3-trisubstituted indanes, in which the benzene ring derives from the arenesulfonyl functionality of the bis(sulfonyl)iodonium ylide