NMR measurement. The electrochemical properties of 8a,b were also studied by CV measurement. Furthermore, the transformation of 8a,b to 3-substituted 7,12-methanocycloundeca[4,5]furo[2,3-d]pyrimidine-2,4(1H,3H)-diones 16a,b was accomplished by oxidative cyclization using DDQ and subsequent ring-opening and ring-closure. The structural details and chemical properties of 16a,b were clarified. Reaction
4,9-甲基
呋喃二烯[5-(4,9-甲基
环己烯-2',4',6',8',10'-
戊烯叉基)
嘧啶-2,4,6(1,3,5研究了H)-三酮]衍
生物8a,b。根据1 H和13 C NMR和UV-vis光谱研究了它们的结构特征。通过可变温度1 H NMR测量发现,围绕8a的环外双键的旋转势垒(ΔG ‡)为12.55kcal mol -1。还通过CV测量研究了8a,b的电
化学性质。此外,改造图8a,b,以3-取代的7,12- methanocycloundeca [4,5]
呋喃并[2,3- d ]
嘧啶-2,4(1 ħ,3 ħ) -二酮16a中,b是通过使用
DDQ和氧化环化来完成随后的开环和闭环。阐明了16a,b的结构细节和
化学性质。16a与
氘化物的反应提供了C13加合物19作为单一产物,因此,
甲醇桥控制亲核攻击,以偏爱内在选择性。16a与
乙烯基化合物3-甲基环庚[4,5]
呋喃[2,3-]的光诱导氧化反应d