Intramolecular cyclization-trapping of carbon radicals by olefins as means to functionalize 2′- and 3′-carbons in β-D-nucleosides
作者:J.-C. Wu、Z. Xi、C. Gioeli、J. Chattopadhyaya
DOI:10.1016/s0040-4020(01)96134-4
日期:——
Intramolecular free-radical addition-cyclization reactions of 1-(5′-O-(MMTr)-3′-deoxy-3′-phenylseleno-2′-O-allyl- or 2′-O-alkynyl-β-D-arabinofuranosyl)uracils 6a – 6d, 1-(5′O-(MMTr)-2′-deoxy-2′-phenylseleno-3′-O-allyl- or 3′-O-alkynyl-β-D-xylofuranosyl)uracils 10 – 10d, 1-(5′-O-(MMTr)-2′-O-allyl-3′-O-phenoxythio carbonyl-β-D-arabinofuranosyl)uracil 25 and 1-(5′-O-(MMTr)-3′-O-allyl-2′-O-phenoxythio carbonyl-β-
1-(5'-O-(MMTr)-3'-脱氧-3'-苯基硒基-2'-O-烯丙基或2'-O-炔基-β-D-的分子内自由基加成环化反应阿拉伯呋喃呋喃糖基)尿嘧啶6a – 6d,1-(5'O-(MMTr)-2'-脱氧-2'-苯基硒基-3'-O-烯丙基或3'-O-炔基-β-D-二呋喃呋喃糖基)尿嘧啶10 – 10d,1-(5'-O-(MMTr)-2'-O-烯丙基-3'-O-苯氧硫羰基-β-D-阿拉伯呋喃糖基)尿嘧啶25和1-(5'-O-(MMTr )-3'-O-烯丙基-2'-O-苯氧基硫羰基-β-D-二呋喃呋喃糖基)尿嘧啶28是非对映体特异性的,并得到纯的[33.0]-β-稠合双呋喃产物,例如1- (3'-脱氧-3'-C,2'-O-((1-烷基)乙烯)-β-D-呋喃呋喃糖基)尿嘧啶7a – 7d,1-(2'-脱氧-2'-C,3 '-O-((1-烷基)乙烯)-β-D-呋喃呋喃糖基)尿嘧啶11a – 11