Symmetric Macrocycles by a Prins Dimerization and Macrocyclization Strategy
摘要:
A tandem dimerization/macrocyclization reaction utilizing the Prins cyclization has been developed. This reaction develops molecular complexity through the formation of highly substituted dimeric tetrahydropyran macrocycles. Mild conditions utilizing rhenium(VII) catalysts were explored for aromatic substrates, while harsher Lewis acidic conditions were used for aliphatic substrates. Both aldehydes and acetals are shown to be viable substrates for this reaction.
Enantioselective Synthesis of 4-Methyl-3,4-dihydroisocoumarin via Asymmetric Hydroformylation of Styrene Derivatives
作者:Bo Qu、Renchang Tan、Madison R. Herling、Nizar Haddad、Nelu Grinberg、Marisa C. Kozlowski、Xumu Zhang、Chris H. Senanayake
DOI:10.1021/acs.joc.8b02813
日期:2019.4.19
Enantioenriched aldehydes are produced through asymmetric hydroformylation of styrene derivatives using BIBOP-type ligands. The featured example is enantioselectivesynthesis of 4-methyl-3,4-dihydroisocoumarin, which was prepared in a 95.1:4.9 enantiomeric ratio from asymmetric hydroformylation of ethyl 2-vinylbenzoate followed by in situ lactonization during the reduction process. The conditions are
Symmetric Macrocycles by a Prins Dimerization and Macrocyclization Strategy
作者:Michael R. Gesinski、Kwanruthai Tadpetch、Scott D. Rychnovsky
DOI:10.1021/ol9022062
日期:2009.11.19
A tandem dimerization/macrocyclization reaction utilizing the Prins cyclization has been developed. This reaction develops molecular complexity through the formation of highly substituted dimeric tetrahydropyran macrocycles. Mild conditions utilizing rhenium(VII) catalysts were explored for aromatic substrates, while harsher Lewis acidic conditions were used for aliphatic substrates. Both aldehydes and acetals are shown to be viable substrates for this reaction.