Allyl, epoxy and glycosyl perfluoroimidates. One-pot preparation and reaction
作者:Noriyuki Nakajima、Miho Saito、Masabumi Kudo、Makoto Ubukata
DOI:10.1016/s0040-4020(02)00305-8
日期:2002.4
obtained trifluoroacetimidates were more stable than the trichloro analogue and were easily purified by SiO2 column chromatography and/or distillation. The 3,3-sigmatropic rearrangement of allylic analogues, acid-catalyzed cyclization of the epoxy analogues and glycosylation of sugar analogues were studied comparing with their corresponding trichloroacetimidates. The trifluoroacetimidates were considerably
描述了烯丙基,环氧和糖基全氟亚氨酸的一锅法制备及其反应。挥发性全氟腈是在-78°C下由具有“活化”二甲基亚砜(DMSO)物种的全氟酰胺生成的。将醇和糖衍生物原位亲核加成腈后,可以制备44-92%的烯丙基,环氧和糖基全氟亚氨酸酯。所获得的三氟乙酰亚氨酸盐比三氯类似物更稳定,并且易于通过SiO 2纯化。柱色谱法和/或蒸馏。与它们相应的三氯乙酰亚胺比较,研究了烯丙基类似物的3,3-σ重排,环氧类似物的酸催化环化和糖类似物的糖基化。由于三氟乙酰基亚胺在亚氨酸酯碳上的吸电子取代基,因此它们的反应性明显低于三氯乙酰基亚胺。