Extremely Crowded Biaryls

Extremely Crowded Biaryls
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极其拥挤的联芳基化合物

DOI:
10.1002/ejoc.202100399
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发表时间:
2021
影响因子:
2.8
通讯作者:
Pascal, Jr., Robert A.
Pascal, Jr., Robert A.
中科院分区:
化学3区
文献类型:
--
作者:
Du, Yuchen;Mague, Joel T.;Pascal, Jr., Robert A.

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通过环己烯酮与取代丁二炔的双Diels-桤木反应制备了高度拥挤的联苯衍生物。2,3,5-三(叔丁基)环戊二烯酮(5)和二苯基丁二炔(3)的反应仅得到单一加合物1-(苯乙炔基)-2-苯基-3,5,6-三叔丁基苯(6),并且即使在极端条件下也没有第二次加成。当四环素(4)加入到双(三甲基硅基)丁二炔(8)中时,实现了两次加成,但在第二次加成期间或紧接在第二次加成之后失去了一个硅基,得到2-(三甲基硅基)-2 ′,3,3 ′,4,4 ′,5,5 ′,6-八苯基联苯(11)。当3,4-二苯基-2,5-二甲基环戊二烯酮(12)与8加成时,生成完全取代的2,2 ′-双(三甲基硅基)-4,4 ′,5,5 ′-四苯基-3,3 ′,6,6 ′-四甲基联苯(14)。化合物11和14的X射线结构显示它们相当拥挤,但中心联苯环没有表现出先前在十苯基联苯中观察到的扭曲。在另一种方法中,将芳炔添加到5,5 ′-双(4-氯苯基)-3,3 ′,4,4 ′-四苯基-2,2 ′-双(环庚烯酮)(18)中。简单的苯炔加两次得到4,4 ′-双(4-氯苯基)-2,2 ′,3,3 ′-四苯基-1,1 ′-联萘(19),产率较低,而由四苯基邻氨基苯甲酸生成的四苯基苯炔只加一次。
Highly congested derivatives of biphenyl were prepared by double Diels‐Alder reactions of cyclopentadienones with substituted butadiynes. The reaction of 2,3,5‐tri(tert‐butyl)cyclopentadienone (5) and diphenylbutadiyne (3) gave only the single adduct, 1‐(phenylethynyl)‐2‐phenyl‐3,5,6‐tri‐tert‐butylbenzene (6), and even extreme conditions gave no second addition. When tetracyclone (4) was added to bis(trimethylsilyl)butadiyne (8), two additions were achieved, but one silyl group was lost either during, or immediately following, the second addition to give 2‐(trimethylsilyl)‐2′,3,3′,4,4′,5,5′,6‐octaphenylbiphenyl (11). However, when 3,4‐diphenyl‐2,5‐dimethylcyclopentadienone (12) was added to8, the fully substituted 2,2′‐bis(trimethylsilyl)‐4,4′,5,5′‐tetraphenyl‐3,3′,6,6′‐tetramethylbiphenyl (14) was formed. The X‐ray structures of compounds11and14show them to be quite crowded, but the central biphenyl rings do not exhibit the distortions previously observed in decaphenylbiphenyl. In an alternative approach, arynes were added to 5,5′‐bis(4‐chlorophenyl)‐3,3′,4,4′‐tetraphenyl‐2,2′‐bis(cyclopentadienone) (18). Simple benzyne added twice to give 4,4′‐bis(4‐chlorophenyl)‐2,2′,3,3′‐tetraphenyl‐1,1′‐binaphthyl (19) in low yield, but tetraphenylbenzyne, generated from tetraphenylanthranilic acid, added only once.
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