[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.
Total Synthesis of <scp>l</scp>-Biopterin from <scp>l</scp>-Tartaric Acid <i>via</i> 5-Deoxy-<scp>l</scp>-arabinose
作者:Anne-Marie Fernandez、Lucette Duhamel
DOI:10.1021/jo961426s
日期:1996.1.1
Acyclic stereoselection. 32. Synthesis and characterization of the diastereomeric (4S)-pentane-1,2,3,4-tetraols