A Stereodivergent Synthesis of All Stereoisomers of Centrolobine: Control of Selectivity by a Protecting-Group Manipulation
作者:Bernd Schmidt、Frank Hölter
DOI:10.1002/chem.200902053
日期:2009.11.9
Allstereoisomers of the natural product centrolobine are selectively synthesized, by starting from a common precursor. Key steps are an enantioselective allylation with enantiomerically pure allylsilanes, a tandem ring‐closing metathesis–isomerization reaction, and a Heck reaction by using an arene diazonium salt. By choosing appropriate conditions for the final deprotection step, either the cis‐configured
Synthesis of 2,6-trans-Tetrahydropyrans Using a Palladium-Catalyzed Oxidative Heck Redox-Relay Strategy
作者:Holly E. Bonfield、Colin M. Edge、Marc Reid、Alan R. Kennedy、David D. Pascoe、David M. Lindsay、Damien Valette
DOI:10.1021/acs.orglett.3c03866
日期:2024.4.12
novel synthetic approaches. We demonstrate the application of a stereoselective Heck redox-relay strategy for the synthesis of functionalized 2,6-trans-tetrahydropyrans in excellent selectivity in a single step from an enantiopure dihydropyranyl alcohol, proceeding through a novel exo-cyclic migration. The strategy has also been applied to the total synthesis of a trans-epimer of the natural product centrolobine