Azaspirocycles alkenes

Metathetic ring closure. Catalyst 1. can be regarded as the standard workhorse for RCM and the scope of its applications continues to expand. Thus, its use in the elaboration of cyclic structures including azaspirocycles," 3-pyrrolines," and those containing phosphine oxides, phosphinates, dioxasilanes, - sulfonamides. l-(Dialkoxyboryl)vinylcycloalkenes are obtained from x-alken-l-ynyl boronates. ... 

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