Facile synthesis of enantiopure tricyclic furanyl derivatives via tungsten-mediated cycloalkenation reactions and Diels–Alder reactions
摘要:
Chiral furanyl diene 1 is easily prepared from cycloalkenation of chiral tungsten alkynol with acetaldehyde, followed by demetalation with Me3NO. This diene bears a chiral 1,3-dioxolane group to control diastereoselective Diels-Alder reactions with electron-deficient olefins. The chiral 1,3-dioxolane substituent of the cycloadducts was degraded to a hydrogen atom to make these molecules possess a common furanyl functionality. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Facile Synthesis of Enantiopure Tricyclic Furanyl and Pyranyl Derivatives via Tungsten-Mediated Cycloalkenation and Diels−Alder Reaction
作者:Heh-Lung Huang、Rai-Shung Liu
DOI:10.1021/jo0205208
日期:2003.2.1
We report the synthesis of chiral furanyl and pyranyl dienes 1 and 2 based on cycloalkenation of chiral tungsten alkynol complexes. These two dienes bear a chiral 1,3-dioxolane group to control diastereoselective Diels-Alder reactions with electron-deficient olefins. The chiral 1,3-dioxolane substituents of the cycloadducts were degraded into hydrogen atoms to make these molecules possess common furan and pyran rings. Dienes 1 and 2 are good building blocks for enantiopure forms of tricyclic oxygen compounds.
Facile synthesis of enantiopure tricyclic furanyl derivatives via tungsten-mediated cycloalkenation reactions and Diels–Alder reactions
作者:Heh-Lung Huang、Heh-Chang Huang、Rai-Shung Liu
DOI:10.1016/s0040-4039(02)01815-4
日期:2002.10
Chiral furanyl diene 1 is easily prepared from cycloalkenation of chiral tungsten alkynol with acetaldehyde, followed by demetalation with Me3NO. This diene bears a chiral 1,3-dioxolane group to control diastereoselective Diels-Alder reactions with electron-deficient olefins. The chiral 1,3-dioxolane substituent of the cycloadducts was degraded to a hydrogen atom to make these molecules possess a common furanyl functionality. (C) 2002 Elsevier Science Ltd. All rights reserved.