The synthesis of polyfunctionalized fused aromatic carbo- and heterocycles from aryl iodides and bromoenoates via a tandem palladium-catalyzed aromatic substitution intramolecularHeck sequence is reported. Using Pd(OAc)2 and tri-2-furylphosphine (TFP) in the presence of norbornene and Cs2CO3 in CH3CN at 85 °C gave a variety of functionalized bi- and tricyclic fused aromatic rings in good yield.
报道了通过串联钯催化的芳族取代分子内Heck序列由芳基碘化物和溴烯酸酯合成多官能化稠合的芳族碳和杂环。在85°C的CH 3 CN中,在降冰片烯和Cs 2 CO 3存在下,使用Pd(OAc)2和三-2-呋喃基膦(TFP),可以得到多种官能化的双环和三环稠合芳环。
A Short and Efficient Synthesis of 4,5-Disubstituted-1-pentenes
作者:Ann De Camp Schuda、Paul H. Mazzocchi、Gregory Fritz、Tina Morgan
DOI:10.1055/s-1986-31594
日期:——
A one step synthesis of 5-chloro-4-hydroxy-1-pentene(65%) and 5-bromo-4-hydroxy-1-pentene (81%) was developed. Treatment of epibromohydrin or epichlorohydrin at -73°C with a reagent prepared from vinylmagnesium bromide and a catalytic amount of copper(I) bromide gave the desired products. 5-Bromo-4-hydroxy-1-pentene was cleanly converted to 4.5-epoxy-1-pentene in 99% yield by treatment with potassium hydroxide. A number of derivatives of 5-bromo-4-hydroxy-1-pentene are described.
found that elementaliodine and bromine are converted to trihalide nucleophiles (triiodine and tribromide anion, respectively) in the presence of catalytic amounts of meso-tetraphenylporphyrins (H2TPP). Therefore a highly regioselective method for the synthesis of beta-haloalcohols through direct ringopening of epoxides with elementaliodine and bromine in the presence of H2TPPs as new catalysts is described
An Easy Procedure for the Highly Regioselective Conversion of Epoxides to Halohydrins
作者:Bonini、Giuliano、Righi、Rossi
DOI:10.1080/00397919208021317
日期:1992.7
Several epoxides and epoxy alcohols have been opened to the corresponding halohydrins by lithium halides with Amberlyst in CH3CN at room temperature : the reaction proceeds in quantitative yields with high degree of regioselectivity.
Dolbier Jr., William R.; Rong, Xiao X.; Bartberger, Michael D., Journal of the Chemical Society. Perkin Transactions 2 (2001), 1998, # 2, p. 219 - 231
作者:Dolbier Jr., William R.、Rong, Xiao X.、Bartberger, Michael D.、Koroniak, Henryk、Smart, Bruce E.、Yang, Zhen-Yu