Stereoselective Synthesis of β-(Chloro)vinylsilanes Using a Regio- and (E)-Stereoselective Bis-Stannylation of Unsymmetrically Substituted Butadiynes: Application to the Synthesis of a Masked Triyne
摘要:
A highly regio- and stereoselective bis-stannylation of unsymmetrically substituted butadiyne 3 provides bis-stannane 4. Selective lithiation of the internal tin residue effects a 1,4-retro-Brook rearrangement to afford vinylsilane 5. This was elaborated into the novel diethynylethene 1, which also functions as a masked triyne.
Synthesis of Highly Substituted Indolines and Indoles via Intramolecular [4 + 2] Cycloaddition of Ynamides and Conjugated Enynes
作者:Joshua R. Dunetz、Rick L. Danheiser
DOI:10.1021/ja051180l
日期:2005.4.1
Ynamides react with conjugated enynes in intramolecular [4 + 2] cycloadditions to afford substituted indolines that undergo oxidation with o-chloranil to furnish the corresponding indoles. The cycloaddition substrates are easily assembled from derivatives of 3-butynylamine by Sonogashira coupling with alkenyl halides followed by copper-catalyzed N-alkynylation with acetylenic bromides. Diynamides participate
Stereoselective Synthesis of β-(Chloro)vinylsilanes Using a Regio- and (<i>E</i>)-Stereoselective Bis-Stannylation of Unsymmetrically Substituted Butadiynes: Application to the Synthesis of a Masked Triyne
作者:Simon M. E. Simpkins、Benson M. Kariuki、Caterina S. Aricó、Liam R. Cox
DOI:10.1021/ol035536e
日期:2003.10.1
A highly regio- and stereoselective bis-stannylation of unsymmetrically substituted butadiyne 3 provides bis-stannane 4. Selective lithiation of the internal tin residue effects a 1,4-retro-Brook rearrangement to afford vinylsilane 5. This was elaborated into the novel diethynylethene 1, which also functions as a masked triyne.