AgOTf/I<sub>2</sub>-Mediated Cyclization/Cross-Coupling/Isomerization of Enynones with Phosphorus Ylides: An Expedient Route to Stereoselective Synthesis of (<i>E</i>)-2-Alkenylfurans
作者:Ling Tang、Yangyi Zhang、Guisheng Deng
DOI:10.1021/acs.joc.1c01109
日期:2021.10.1
Ag(I)-catalyzed cascade reactions involving enynone cyclization and cross-coupling with phosphorus ylides have been achieved for the first time. Subsequent treatment of the reaction mixture with I2 afforded the corresponding (E)-α-alkenylfurans in 73–95% yields with excellent stereoselectively. A reasonable mechanism has been proposed.
首次实现了涉及烯炔酮环化和与磷叶立德交叉偶联的 Ag(I) 催化级联反应。随后用 I 2处理反应混合物,以 73-95% 的收率得到相应的 ( E )-α-烯基呋喃,并具有优异的立体选择性。提出了合理的机制。
Stereoselective Synthesis of (2Z)-α-Bromo-α,β-Unsaturated esters via arsonium ylide
Tandem reaction of α-hypervalent iodo functionalized phosphonium and arsonium ylides as umpolung reagents
作者:Zhi-Zhen Huang、Xiao-Chun Yu、Xian Huang
DOI:10.1016/s0040-4039(02)01503-4
日期:2002.9
α-Hypervalent iodo functionalized phosphonium and arsonium ylides 2 can be used as umpolung ylides to react with nucleophiles to give α-heteroatom substituted ylides 4 in good yields. A tandem sequence of nucleophilic substitution then Wittig reaction occurs smoothly to form (Z)-α-halo-α,β-unsaturated esters 6, stereoselectively, in moderate to excellent yields.