Abstract
Diastereoselective Pd-catalyzed (3+2) and (4+2) cycloaddition reactions of sulfamidate imine-derived 1-azadienes with zwitterionic N-dipoles derived from 1-tosyl-2-vinylaziridine and 4-vinylbenzoxazinone have been developed. These reactions provide highly functionalized azaspirocycles featuring three contiguous stereocenters. The sulfonyl imine moiety of the cycloadducts can be fully reduced to access valuable β-amino alcohols.
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