Regioselective Synthesis of Substituted Tetrahydrofurans through Prins Cyclization
作者:Li-Ming Zhao、Fei Dou、Rui Sun、Ai-Li Zhang
DOI:10.1055/s-0033-1341273
日期:——
The synthesis of functionalizedtetrahydrofurans was accomplished through the TfOH-catalyzed Prins cyclization. The reaction proceeded regioselectively at the internal alkene carbon in the presence of catalytic amounts of TfOH to afford the five-membered ring, rather than the typical six-membered ring. Another attractive feature of this protocol is the metal catalyst-free characteristic of the cyclization
Hydroxyl-Directed Cross-Coupling: A Scalable Synthesis of Debromohamigeran E and Other Targets of Interest
作者:Thomas P. Blaisdell、James P. Morken
DOI:10.1021/jacs.5b05477
日期:2015.7.15
A hydroxyl functional group positioned beta to a pinacol boronate can serve to direct palladium-catalyzed cross-coupling reactions. This feature can be used to control the reaction site in multiply borylated substrates and can activate boronates for reaction that would otherwise be unreactive.