Total syntheses of the diterpenoids (±)-verrucosan-2β-ol, (±)-neoverrucosan-5β-ol, and (±)-homoverrucosan-5β-ol. An approach to the synthesis of the sesterterpenoid variecolin
作者:Edward Piers、Serge L. Boulet
DOI:10.1016/s0040-4039(97)10507-x
日期:1997.12
Efficient total syntheses of the racemic versions of the diterpenoids verrucosan-2β-ol (5), neoverrucosan-5β-ol (6), and homoverrucosan-5β-ol (7) are described. The production of the key intermediate 15 suggests a possible synthetic approach to the tetracyclic natural product variecolin (1).
Cyclopentene and cyclohexene annulation via copper-catalyzed conjugate addition of acetal-containing Grignard reagents
作者:Swati A. Bal、Anthony Marfat、Paul Helquist
DOI:10.1021/jo00147a001
日期:1982.12
Total syntheses of the sesquiterpenoids (+)-trans-dracunculifoliol and (+)-4-hydroxyoppositan-7-one
作者:Renata M. Oballa、Rebekah Carson、Susan Lait、Jay A. Cadieux、Joël Robichaud
DOI:10.1016/j.tet.2005.01.089
日期:2005.3
Sesquiterpenoids (+)-trans-dracuncuflifoliol (1) and (+)-4-hydroxyoppositan-7-one (2) were prepared stereoselectively from enantiomerically pure (7aR)-7a-methyl-1,2,5,6,7,7a-hexahydro-4H-inden-4-one ((-)-6), whose synthesis was described herein. Conjugate addition of the organocopper (1) reagent 10 to (-)-6, followed by epimerization of the ring junction, generated 3 of the 4 contiguous chiral centers of both natural products. (c) 2005 Elsevier Ltd. All rights reserved.