Exploiting Quadrupolar Interactions in the Synthesis of the Macrocyclic Portion of Longithorone C
摘要:
2,3,4,5,6-Pentafluorobenzyl and 3,5-bistrifluoromethylbenzyl ester auxiliaries can enable difficult macrocyclizations to afford rigid all-carbon paracyclophanes. The effectiveness of these auxiliaries has been demonstrated in preparing the carbon skeleton of the macrocyclic natural product longithorone C.
Exploiting Quadrupolar Interactions in the Synthesis of the Macrocyclic Portion of Longithorone C
摘要:
2,3,4,5,6-Pentafluorobenzyl and 3,5-bistrifluoromethylbenzyl ester auxiliaries can enable difficult macrocyclizations to afford rigid all-carbon paracyclophanes. The effectiveness of these auxiliaries has been demonstrated in preparing the carbon skeleton of the macrocyclic natural product longithorone C.
Exploiting Non-Covalent Interactions in Synthesis: Macrocyclization Employing Amide-Based Auxiliaries
作者:Yassir El-Azizi、Joseph E. Zakarian、Lisa Bouillerand、Andreea R. Schmitzer、Shawn K. Collins
DOI:10.1002/adsc.200800365
日期:2008.10.6
Efficient macrocyclic olefin and en-yne metathesis can be conducted employing benzyl ester auxiliaries that engage in quadrupolar interactions. The use of amide linkers in place of esters results in higher overall yields. Computational studies suggest that amide auxiliaries stabilize conformers conducive to macrocyclization over 22 times more efficiently than an ester linkage. Molecular modelling studies