Strategies to Control Alkoxy Radical-Initiated Relay Cyclizations for the Synthesis of Oxygenated Tetrahydrofuran Motifs
摘要:
Radical relay cyclizations initiated by alkoxy radicals are a powerful tool for the rapid construction of substituted tetrahydrofurans. The scope of these relay cyclizations has been dramatically increased with the development of two strategies that utilize an oxygen atom in the substrate to accelerate the desired hydrogen atom transfer (HAT) over competing pathways. This has enabled a chemoselective 1,6-HAT over a competing 1,5-HAT. Furthermore, this allows for a chemoselective 1,5-HAT over competing direct cyclizations and beta-fragmentations. Oxygen atom incorporation leads to a general increase in cyclization diastereoselectivity over carbon analogues. This chemoselective relay cyclization strategy was utilized in the improved synthesis of the tetrahydrofuran fragment in (-)-amphidinolide K.
Catalyst and process for hydrogenating olefinically unsaturated compound
申请人:JSR Corporation
公开号:EP0974602B1
公开(公告)日:2004-01-02
US6291596B1
申请人:——
公开号:US6291596B1
公开(公告)日:2001-09-18
[EN] COMPOSITIONS AND METHODS FOR TREATING LEUKEMIA<br/>[FR] COMPOSITIONS ET MÉTHODES DE TRAITEMENT DE LA LEUCÉMIE
申请人:DANA FARBER CANCER INST INC
公开号:WO2011143660A2
公开(公告)日:2011-11-17
The invention provides compositions, methods, and kits for the treatment of acute myeloid leukemia in a subject.
Strategies to Control Alkoxy Radical-Initiated Relay Cyclizations for the Synthesis of Oxygenated Tetrahydrofuran Motifs
作者:Hai Zhu、Joe C. T. Leung、Glenn M. Sammis
DOI:10.1021/jo502499a
日期:2015.1.16
Radical relay cyclizations initiated by alkoxy radicals are a powerful tool for the rapid construction of substituted tetrahydrofurans. The scope of these relay cyclizations has been dramatically increased with the development of two strategies that utilize an oxygen atom in the substrate to accelerate the desired hydrogen atom transfer (HAT) over competing pathways. This has enabled a chemoselective 1,6-HAT over a competing 1,5-HAT. Furthermore, this allows for a chemoselective 1,5-HAT over competing direct cyclizations and beta-fragmentations. Oxygen atom incorporation leads to a general increase in cyclization diastereoselectivity over carbon analogues. This chemoselective relay cyclization strategy was utilized in the improved synthesis of the tetrahydrofuran fragment in (-)-amphidinolide K.