Nucleophilic Addition of Amines to Ruthenium Carbenes:<i>ortho</i>-(Alkynyloxy)benzylamine Cyclizations towards 1,3-Benzoxazines
作者:Carlos González-Rodríguez、José Ramón Suárez、Jesús A. Varela、Carlos Saá
DOI:10.1002/anie.201410284
日期:2015.2.23
ortho‐(alkynyloxy)benzylamines to dihydro‐1,3‐benzoxazines is reported. The cyclization is thought to take place via the vinyl ruthenium carbene intermediates which are easily formed from [Cp*RuCl(cod)] and N2CHSiMe3. The mild reaction conditions and the efficiency of the procedure allow the easy preparation of a broad range of new 2‐vinyl‐2‐substituted 1,3‐benzoxazine derivatives. Rearrangement of
Silyl-Group Boosted Internal Redox Reaction: Hydride Shift from an Aliphatic Secondary Position for the Formation of Six- and Seven-Membered Carbocycles
作者:Hiroto Okawa、Tomoko Kawasaki-Takasuka、Keiji Mori
DOI:10.1021/acs.orglett.4c00140
日期:2024.3.1
We report a hydride shift/cyclization reaction at the aliphatic secondary position (methylene group). The key to accomplishing this reaction was the employment of benzylidene malonate having a silyl group β to the hydride donor carbon. When the corresponding malonates were treated with a catalytic amount of Al(OTf)3, the [1,5]-hydride shift from the simple aliphatic secondary position proceeded smoothly