Reinvestigation of Mucohalic Acids, Versatile and Useful Building Blocks for Highly Functionalized α,β-Unsaturated γ-Butyrolactones
摘要:
[GRAPHICS]Mucohalic acids (mucochloric acid (1, 3,4-dichloro-5-hydroxy-5H-furan-2-one) and mucobromic acid (2, 3,4-dibromo-5-hydroxy-5H-furan-2-one)) are inexpensive, commercially available starting materials with multiple functional groups. These compounds have been modified by way of reduction followed by Suzuki cross-coupling reactions involving arylboronic acids to afford highly functionalized alpha,beta-unsaturated gamma-butyrolactones in excellent yield. The synthetic utility of these building blocks was effectively demonstrated through preparation of the antiinflammatory drug Vioxx.
Preparation of aryl-substituted butenolides using mucohalic acids
申请人:Blazecka Garth Peter
公开号:US20050131239A1
公开(公告)日:2005-06-16
Methods and materials for preparing 3-aryl-2-buten-4-olides and 2,3-bisaryl-2-buten-4-olides are disclosed. The methods include reacting a mucohalic acid with a reducing agent to give a 2,3-dihalo-2-buten-4-olide, which undergoes at least one Pd catalyzed cross-coupling reaction with an arylboronic acid.
Reinvestigation of Mucohalic Acids, Versatile and Useful Building Blocks for Highly Functionalized α,β-Unsaturated γ-Butyrolactones
作者:Ji Zhang、Peter G. Blazecka、Daniel Belmont、James G. Davidson
DOI:10.1021/ol027122b
日期:2002.12.1
[GRAPHICS]Mucohalic acids (mucochloric acid (1, 3,4-dichloro-5-hydroxy-5H-furan-2-one) and mucobromic acid (2, 3,4-dibromo-5-hydroxy-5H-furan-2-one)) are inexpensive, commercially available starting materials with multiple functional groups. These compounds have been modified by way of reduction followed by Suzuki cross-coupling reactions involving arylboronic acids to afford highly functionalized alpha,beta-unsaturated gamma-butyrolactones in excellent yield. The synthetic utility of these building blocks was effectively demonstrated through preparation of the antiinflammatory drug Vioxx.
Mucochloric Acid: A Useful Synthon for the Selective Synthesis of 4-Aryl-3-chloro-2(5H)-furanones, (Z)-4-Aryl-5-[1-(aryl)methylidene]-3-chloro-2(5H)-furanones and 3,4-Diaryl-2(5H)-furanones
4-Dichloro-2(5H)-furanone, which has been prepared efficiently from mucochloricacid, has been transformed selectively into 4-aryl-3-chloro-2(5H)-furanones either by Suzuki- or Stille-type reactions. These monochloro derivatives have been used as precursors either to (Z)-4-aryl-5-[1-(aryl)methylidene]-3-chloro-2(5H)-furanones, including naturally occurring rubrolide M, or to unsymmetrical 3,4-diaryl-2(5H)-furanones