摘要:
The synthesis of 2'-phosphonomethyl(3',4'-dihydroxylbutyl nucleotides of cytosine and guanine 13 and 15 possessing the 2'S,3'S absolute configuration was readily accomplished in eleven and ten steps respectively from L-ascorbic acid via the protected tetrols 9 and 8. Alcohol 8 undergoes efficiently a regiospecific Mitsunobu coupling with 6-chloro-2-aminopurine to furnish the N-9 isomer which was further transformed to 15. (C) 1997 Elsevier Science Ltd.