Hybridization into a Bitopic Ligand Increased Muscarinic Receptor Activation for Isopilocarpine but Not for Pilocarpine Derivatives
作者:Christine S. Heinz、Marcel Bermudez、Natasha Jaiswal、Carolin Große、Michael Kauk、Carsten Hoffmann、Ulrike Holzgrabe
DOI:10.1021/acs.jnatprod.2c01079
日期:2023.4.28
Convergent Diastereoselective Synthesis of Isopilocarpine by One-Pot Michael-Addition-Alkylation Reaction
作者:Manfred Braun、Corinna Bühne、Dimitrula Cougali、Klaus Schaper、Walter Frank
DOI:10.1055/s-2004-831245
日期:——
The metalated dithiane 7b available from imidazole aldehyde 6 is reacted with furanone 4 and ethyl iodide to give the lactone 8, which forms diastereoselectively. Its configuration is determined to be trans by means of a crystal structure analysis. The desulfurization of 8 leads to the alkaloid isopilocarpine 2 in three steps and 25% overall yield. The relative energies of the diastereomeric alkaloids 1 and 2 have been calculated.