Synthesis of (+)-goniothalesdiol and (+)-7-epi-goniothalesdiol
作者:Matej Babjak、Peter Kapitán、Tibor Gracza
DOI:10.1016/j.tet.2005.01.004
日期:2005.2
A total synthesis of (+)-goniothalesdiol, a 3,4-dihydroxy-2,5 -disubstituted tetrahydrofuran isolated from Goniothalamus borneensis (Annonaceae), and its 7-epimer is reported using oxycarbonylation methodology for construction of polyhydroxylated substituted heterocycles. Diastereoselectivity of addition of organometallic reagents to 2,3-O-isopropylidene-D-threose derivatives using theoretical calculations based on the semiempirical PM5 was studied. (C) 2005 Elsevier Ltd. All rights reserved.
The first total synthesis of goniothalesdiol
作者:Matej Babjak、Peter Kapitán、Tibor Gracza
DOI:10.1016/s0040-4039(02)01599-x
日期:2002.9
The first totalsynthesis of goniothalesdiol, a dihydroxylated tetrahydrofuran isolated from Goniothalamus borneensis (Annonaceae), and its 7-epimer is described starting with d-mannitol. The key step of these syntheses is palladium(II)-catalyzed oxycarbonylation of unsaturated triols with d-lyxo and d-xylo configuration, respectively, which allowed efficient construction of the tetrahydrofuran ring
times but comparable yields and selectivity. We report substantially improved reaction conditions for palladium(II)-catalyzed tandem cyclization–intramolecular oxycarbonylation of (amino)polyols with a terminal double bond, based on utilization of iron pentacarbonyl [Fe(CO)5] as an affordable and safe liquid supply of the carbonyl unit fully replacing gaseouscarbonmonoxide. Direct comparison with the