[Graphics]A catalytic procedure is described for decarbonylation of unprotected aldoses to afford alditols with one less carbon atom. The reaction is performed with the rhodium complex Rh(dPPP)(2)Cl in a refluxing diglyme-DMA solution. A slightly improved catalyst turnover is observed when a catalytic amount of pyridine is added. Under these conditions most hexoses and pentoses undergo decarbonylation into the corresponding pentitols and tetrols in isolated yields around 70%. The reaction has been applied as the key transformation in a five-step synthesis of L-threose from D-glucose.
Decarbonylation of unprotected aldose sugars by chlorotris(triphenylphosphine)rhodium(I). A new descent of series approach to alditols, deoxyalditols, and glycosylalditols
作者:Mark A. Andrews、George L. Gould、Stephen A. Klaeren
DOI:10.1021/jo00283a017
日期:1989.10
Rhodium-Catalyzed Decarbonylation of Aldoses
作者:Rune Nygaard Monrad、Robert Madsen
DOI:10.1021/jo7017729
日期:2007.12.1
[Graphics]A catalytic procedure is described for decarbonylation of unprotected aldoses to afford alditols with one less carbon atom. The reaction is performed with the rhodium complex Rh(dPPP)(2)Cl in a refluxing diglyme-DMA solution. A slightly improved catalyst turnover is observed when a catalytic amount of pyridine is added. Under these conditions most hexoses and pentoses undergo decarbonylation into the corresponding pentitols and tetrols in isolated yields around 70%. The reaction has been applied as the key transformation in a five-step synthesis of L-threose from D-glucose.