1,5-Hydrogen transfers from carbon to N-tributyltin substituted nitrogen
作者:Sunggak Kim、Kyu Man Yeon、Kwang Sub Yoon
DOI:10.1016/s0040-4039(97)00779-x
日期:1997.6
1,5-H transfersfromcarbon to N-tributyltin substituted nitrogen proceeded smoothly and were much more efficient than 1,5-H transfersfromcarbon to ordinary nitrogen. 1,5-Tribuyltin group transferfromcarbon to nitrogen and intramolecular addition of an aminyl radical to a nirile group were also observed for the first time.
Yttrium-Catalyzed Intramolecular Hydroalkoxylation/Claisen Rearrangement Sequence: Efficient Synthesis of Medium-Sized Lactams
作者:Bo Zhou、Long Li、Xin-Qi Zhu、Juan-Zhu Yan、Yi-Lin Guo、Long-Wu Ye
DOI:10.1002/anie.201700596
日期:2017.3.27
An efficient yttrium‐catalyzed intramolecular hydroalkoxylation/Claisen rearrangement sequence has been achieved, thus enabling facile access to a diverse array of valuable medium‐sized lactams. Furthermore, a mechanistic rationale for this novel cascade reaction is well supported by a variety of control experiments.
Nucleophilic Cycloaromatization of Ynamide-Terminated Enediynes
作者:Andrei Poloukhtine、Valentin Rassadin、Alexander Kuzmin、Vladimir V. Popik
DOI:10.1021/jo101238x
日期:2010.9.3
ynamide fragment. The resulting ketenimmonium cation then cyclizes to produce naphthyl cation, which rapidly reacts with nucleophiles or undergoes Friedel−Crafts addition to aromatic compounds. In alcohols, addition of the nucleophilic solvent across the activated triple bond competes with the cyclization reaction. The ratio of cyclized to solvolysisproducts decreases with the increase in ring size.