Synthesis of furanoid terpenes via an efficient palladium-catalyzed cyclization of 4,6-dienols
摘要:
The total syntheses of marmelo oxides A and B and a terpene alcohol found in peppermint oil are described. The key steps in these syntheses are the regioselective palladium-catalyzed allylic substitution of 4 and 11 to 6a and 12, respectively, and the regioselective palladium-catalyzed cyclization of 8 and 14 to 9a, 9b, and 15, respectively. The relative stereochemistry of marmelo oxides A and B was established by NOE measurements.
Concise, Enantioselective, and Versatile Synthesis of (−)-Englerin A Based on a Platinum-Catalyzed [4C+3C] Cycloaddition of Allenedienes
作者:Ronald Nelson、Moisés Gulías、José L. Mascareñas、Fernando López
DOI:10.1002/anie.201607348
日期:2016.11.7
A practical synthesis of (−)‐englerin A was accomplished in 17 steps and 11 % global yield from commercially available achiral precursors. The key step consists of a platinum‐catalyzed [4C+3C] allenediene cycloaddition that directly delivers the trans‐fused guaiane skeleton with complete diastereoselectivity. The high enantioselectivity (99 % ee) stems from an asymmetric ruthenium‐catalyzed transfer
作者:George A. Kraus、Jeff Raggon、P.J. Thomas、Dan Bougie
DOI:10.1016/s0040-4039(00)80824-2
日期:1988.1
The first examples of intramolecular Diels-Alder reactions on indoles indicate that this reaction may be employed for the direct preparation of highly functionalized dihydroindoles. The hybridization of the atoms in the tether plays a crucial role.