Diels-alder reaction of 2′,3′-unsaturated-3′-nitro-thymidine. First chemical evidence of nitroxide radical formation in the radical-promoted denitration reaction
作者:N. Hossain、J. Plavec、C. Thibaudeau、J. Chattopadhyaya
DOI:10.1016/s0040-4020(01)91224-4
日期:1993.1
Diels-Alder reaction of an appropriately functionalized nucleoside [2′,3′-dideoxy-2′,3′-didehydro-3′-nitrothymidine (1)] has been used for the first time as a substrate to yield various unique fused 2′,3′-dideoxy-2′,3′-bis-substituted nucleoside derivatives (2 – 5, 8 – 16) which are not hithertofore available through any other known routes. First unequivocal evidence of the formation of nitroxide radical
适当功能化的核苷[2',3'-二脱氧-2',3'-二氢-3'-硝基胸苷(1)]的狄尔斯-阿尔德反应首次用作底物以产生各种独特的稠合2 ',3'-二脱氧-2',3'-双-取代的核苷衍生物(2 - 5,8 - 16),其是迄今为止在不可通过任何其它已知的路由。正丁基期间硝基氧自由基的形成的第一明确的证据3 SNH促进脱硝反应已经通过cycloadducts(稠合4H-5,6-二氢-1,2-恶嗪衍生物的分离被还提出6,7,18 ,19)是由于在分子内反应中氮氧化物自由基被烯烃或酮官能团捕获而形成的。