Efficient syntheses of l-ribose and 2-deoxy l-ribose from d-ribose and l-arabinose
摘要:
Interconversion of the ends of D-ribose 2 afforded in 6 steps and 45% overall yield L-ribose 1, from which 2-deoxy L-ribose 12 was easily prepared. In addition, the inexpensive L-arabinose 13 was also converted into 2-deoxy L-ribose 12 via a reductive radical rearrangement of the arabinopyranosyl bromide 14. (C) 1997 Elsevier Science Ltd.
New efficient routes for the high-yielding synthesis of several classes of modified nucleosides have been developed. We have prepared both the D- and L-enantiomers of the methylene-expanded oxetanocin isonucleosides 1a-e and the L-2',3'-dideoxy isonucleosides 2abc (both the oxa and thia analgoues) as well as new routes for the preparation of L-ribose and 2-deoxy L-ribose 3ab and their modified nucleosides 4.