Montmorillonite K-10 promoted synthesis of chiral dioxa-caged compounds derived from levoglucosenone
作者:Mariano A. Zurita、Aylén Avila、Rolando A. Spanevello、Alejandra G. Suárez、Ariel M. Sarotti
DOI:10.1016/j.carres.2014.07.019
日期:2015.1
A short and efficient methodology for the synthesis of chiral dioxa-caged compoundsfrom levoglucosenone, a biomass-derived enone, is herein presented. The key transformation, that involves a cascade 3-step cationic cyclization, was efficiently carried out in high yields and selectivities by Montmorillonite K-10 catalysis. The usefulness of K-10 in related semi-pinacol rearrangements to obtain pyran-3-ones
Assessing the halogen effect in Diels–Alder reactions involving chiral α-halo enones. A combined experimental and DFT computational approach
作者:Ariel M. Sarotti、Rolando A. Spanevello、Alejandra G. Suárez
DOI:10.1016/j.tetlet.2011.05.143
日期:2011.8
experimental and computational study was conducted to assess the effect of chlorine and bromine substitution in Diels–Alderreactions involving chiral α-halo enones as dienophiles. An important rate enhancement was observed in the case of acyclic dienes, while the use of cyclic dienes resulted in prolonged reaction times and lower yields. DFT calculations suggest that these reactions are governed by finely