IPy2BF4-Mediated Rearrangements of 1,2-Difunctionalized Compounds and Olefins
作者:Francisco J. Fañanás、Mónica Álvarez-Pérez、Félix Rodríguez
DOI:10.1002/chem.200500070
日期:2005.10.7
Acetal derivatives are easily obtained from 1,2-difunctionalizedcompounds by a new reaction mediated by IPy2BF4 with a mechanism based on a 1,2-migration of aryl or alkyl groups. A new oxidative rearrangement reaction of olefins is also described. Moreover, when this metal-free protocol is applied to cyclic olefins, interesting ring-contraction reactions are observed. The new methodologies described
Total Diastereofacial Selective Iodofunctionalization of Terpene Derivatives Based on Ipy<sub>2</sub>BF<sub>4</sub>
作者:José Barluenga、Mónica Alvarez-Pérez、Félix Rodríguez、Fracisco J. Fañanás、José A. Cuesta、Santiago García-Granda
DOI:10.1021/jo034517f
日期:2003.8.1
Acetonides 1, easily obtained from simple terpenes, react with bispyridine iodonium (I) tetrafluoroborate (Ipy(2)BF(4)) and tetrafluoroboric acid in the presence of nucleophiles to give the corresponding adducts 2 with complete regio and diastereofacial control. Acetonides 1 containing a properly located phenyl or benzyloxy group easily undergo iodocyclization to furnish compounds 3 and 4.