3-exo,3′-exo-(1R,1′R)-Bithiocamphor — a versatile source for functionally different 3,3′-bibornane derivatives — I. Ring-closure reactions and prototropic rearrangements
作者:Werner Schroth、Ekkehard Hintzsche、Roland Spitzner、Dieter Ströhl、Joachim Sieler
DOI:10.1016/0040-4020(95)00852-y
日期:1995.11
The title compound 3, derived from (+)-camphor, allows preparatively useful conversions to be carried out at the 3,3′-bibornane skeleton. The reactions are characterized by steric factors. Despite the increasing steric strain in the bicyclic units, ring-closure reactions of 3 to born-2-ene anellated sulfur-heterocycles are possible, including the formation of the 1,2-dithiine (6), thiophene (11), and
衍生自(+)-樟脑的标题化合物3允许在3,3'-联萘烷烷骨架上进行制备上有用的转化。反应以空间因素为特征。尽管双环单元中的空间应变增加,但3到生成的2烯代芳族硫杂环的闭环反应还是可能的,包括形成1,2-二硫氨酸(6),噻吩(11)和1分别是,2,3-三硫平系统(13)。化合物6的特点是具有几种不同的性质。与脂肪族硫酮的正常行为相反,3不能作为烯醇存在。后者和相关中间体可通过1,5-质子重排立即稳定,从而导致冰片亚烷基单元,例如16个及以上的产品。