作者:Iris R. M. Tébéka、Giovanna B. Longato、Marcus V. Craveiro、João E. de Carvalho、Ana L. T. G. Ruiz、Luiz F. Silva
DOI:10.1002/chem.201202413
日期:2012.12.21
reported for cis‐trikentrins and herbindoles, which are indole alkaloids unsubstituted at the C2 and C3 positions that bear a trans‐1,3‐dimethylcyclopentyl unit. Herein, we describe the first asymmetric and stereoselective synthesis of the more challenging trans‐trikentrin A as its naturally occurring isomer. Different approaches were investigated and the strategy of choice was a combination of an enzymatic
A new approach to the synthesis of cyclopenta[g]indole derivatives possessing structural features of natural alkaloids, such as trikentrins and herbindols, is described. The key step in the sequence is a thallium(III)-mediated ring-contraction reaction to transform a cyclohexene moiety into a functionalized cyclopentyl unit.