On the [3 + 2] Annulation of Cyclic Allylsilanes with N-Phenyltriazolinedione: An Enantio- and Diastereoselective Synthesis of cis-1,3-Diaminocyclitols
摘要:
Improved conditions were found to trigger [3 + 2] annulation of cyclic allylsilanes with N-phenyltriazolinedione (PTAD); the products from this reaction were readily tailored into cis-1,3-diaminocyclitols in highly enantioenriched form with full stereochemical control of up to four contiguous stereogenic centers.
On the [3 + 2] Annulation of Cyclic Allylsilanes with <i>N</i>-Phenyltriazolinedione: An Enantio- and Diastereoselective Synthesis of <i>cis</i>-1,3-Diaminocyclitols
作者:Raudra T. Dey、Tarun K. Sarkar
DOI:10.1021/jo100724w
日期:2010.7.2
Improved conditions were found to trigger [3 + 2] annulation of cyclic allylsilanes with N-phenyltriazolinedione (PTAD); the products from this reaction were readily tailored into cis-1,3-diaminocyclitols in highly enantioenriched form with full stereochemical control of up to four contiguous stereogenic centers.
Catalytic Asymmetric [3+2] Annulation of Allylsilanes with Isatins: Synthesis of Spirooxindoles
作者:Nadine V. Hanhan、Nicolas R. Ball-Jones、Ngon T. Tran、Annaliese K. Franz
DOI:10.1002/anie.201105739
日期:2012.1.23
Silyl‐inspired spirocycle: The title reaction is the first example of a catalytic asymmetric [3+2] annulation reaction with allylsilanes. The annulation reaction utilizes a chiral ScCl2(SbF6)/L catalyst and TMSCl as a promoter to afford spirooxindoles in excellent enantioselectivity at room temperature. The SiC bond can be oxidized to deliver hydroxy‐substituted spirooxindoles. TMS=trimethylsilyl