Stereocontrolled and Versatile Total Synthesis of Bispyrrolidinoindoline Diketopiperazine Alkaloids: Structural Revision of the Fungal Isolate (+)-Asperdimin
作者:Carlos Pérez-Balado、Paula Rodríguez-Graña、Ángel R. de Lera
DOI:10.1002/chem.200901056
日期:2009.9.28
According to this strategy, the natural products (+)‐WIN 64821 1, (+)‐WIN 64745 2 and (+)‐asperdimin 6 as well as analogues (5, 22, 32, 44) with different relative and absolute configuration have been efficiently synthesized. The flexibility of this synthetic methodology has facilitated the structural revision of the natural product (+)‐asperdimin, whose structure has been corrected to diastereomer 6
Residual Dipolar Coupling Enhanced NMR Spectroscopy and Chiroptics: A Powerful Combination for the Complete Elucidation of Symmetrical Small Molecules
作者:Carlos Pérez-Balado、Han Sun、Christian Griesinger、Ángel R. de Lera、Armando Navarro-Vázquez
DOI:10.1002/chem.201101385
日期:2011.10.17
Absolute configuration assignment: Residual dipolar coupling (RDC)‐enhanced NMR spectroscopy provides detailed configurational and conformational information on a symmetric homodimeric chiral organic compound. This allows unequivocal assignment of absolute configuration by using electronic circular dichroism and time‐dependent (TD)‐DFT computations.