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Allenoate has received significant interests in organic synthesis due to its facile preparation and versatile reactivity.1 For instance,the nucleophilic addition and electrophilic addition reactions with a wide range of substances as well as rearrangements have been well documented.In particular,they were proven to be valuable building blocks in many types of cycloaddition reactions.2 In this field,phosphine-catalyzed cycloaddition reaction is of great interest due to simple reagent and structural diversity of the adduct.