Hyrtiosanes from Labdanes: (-)-Hyrtiosal from Sclareol
作者:Pilar Basabe、Alberto Diego、David Díez、Isidro S. Marcos、Faustino Mollinedo、Julio G. Urones
DOI:10.1055/s-2002-33332
日期:——
(-)-Hyrtiosal and its C-16 epimer have been prepared from sclareol in moderate yield. The absolute configuration of natural product (-)-hyrtiosal has being determined.
Herein, the synthesis of 4-methyldecarboxyhaumanamide (9) and 4-methyldecarboxyspongolactams A (11) and C (13) is presented. (-)-Sclareol is the starting material and the chloroderivative 7 is the common intermediate. Moreover, this synthesis represents a new strategy for the preparation of pyrrolinones. (C) 2010 Elsevier Ltd. All rights reserved.
Nor-limonoid and homoisoanticopalane lactones from methyl isoanticopalate
作者:Pilar Basabe、Sergio Delgado、Isidro S. Marcos、David Diez、Alberto Diego、Mónica de Román、Francisca Sanz、J.G. Urones
DOI:10.1016/j.tet.2007.06.004
日期:2007.9
A nor-limonoid with a gamma-hydroxybutenolide group was obtained starting from the known methyl isoanticopalate. A new route for the synthesis of several lactones with a homoisoanticopalane skeleton has been opened. The stereochemistry of three intermediates was established by X-ray determination. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis of the Scalarane Sesterterpenoid 16-deacetoxy-12-<i>epi</i>-scalarafuranacetate
starting from (−)-sclareol, with high stereoselectivity and an overall yield of 6.1%. The intermediate 16-deacetoxy-12-epi-scalarafuran could be easily transformed into a series of natural scalarane sesterterpenoids in a few steps.