Studies on the synthesis of the quartromicins: partial stereochemical assignment of quartromicins A3 and D3 and diastereoselective synthesis of the endo- and exo-spirotetronate subunits
作者:William R Roush、David A Barda、Chris Limberakis、Roxanne K Kunz
DOI:10.1016/s0040-4020(02)00656-7
日期:2002.8
A partial stereochemical assignment of quartromicins A3 and D3 is presented, along with diastereoselective syntheses of the endo- and exo-spirotetronates 1 and 2, corresponding to the galacto and agalacto fragments of the proposed quartromicin stereostructure. The key steps of these syntheses are highly enantio- and diastereoselective Lewis acid catalyzed Diels–Alder reactions of 1,1,3,4-tetrasubstituted
quartromicins A的局部立体化学指定3和d 3被呈现,用非对映选择性合成沿着内切-和外切-spirotetronates 1和2中,对应于半乳糖和agalacto拟议quartromicin立体的片段。这些合成的关键步骤是高度对映体和非对映体选择性路易斯酸催化1,1,3,4-四取代的二烯24的Diels-Alder反应。