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a) Selected azetidine‐containing spirocyclic pharmaceuticals. b) Previous work: (i) electrophile‐induced ring opening of ABB and (ii) ABB‐Li in the synthesis of azetidinyl boronic esters. c) This work: strain‐release driven spirocyclization of azabicyclo[1.1.0]butyl ketones. LG=leaving group.
