Phosphazene Base-Catalyzed Intramolecular Cascade Reactions of Aryl-Substituted Enynes
作者:Jin-Heng Li、Jian-Sheng Tang、Ye-Xiang Xie、Zhi-Qiang Wang、Chen-Liang Deng
DOI:10.1055/s-0030-1258172
日期:2010.9
A novel method for the synthesis of 9-aryl-3a,4-dihydronaphtho[2,3-c]furan-1(3H)-ones has been developed by P4-t-Bu-catalyzed intramolecular cascade reactions of enynes. In the presence of a catalytic amount of phosphazene P4-t-Bu base, a variety of 3-arylallyl 3-arylpropiolates underwent the cascade cyclization reaction smoothly in moderate to excellent yields.
Intramolecular Didehydro-Diels–Alder Reaction for the Synthesis of Benzo- and Dihydrobenzo-Fused Heterocycles
作者:Ashley E. Bober、Justin T. Proto、Kay M. Brummond
DOI:10.1021/acs.orglett.7b00155
日期:2017.4.7
intramolecular didehydro-Diels–Alder reaction, ene–yne substitutedpyrroles, thiophenes, and furans afford functionalized indoles, benzothiophenes, and benzofurans and the corresponding dihydroaromatic products. Product selectivity for the aromatic or dihydroaromatic product is controlled by the reaction conditions, which vary depending upon the substrate.