The potassium 2-substituted bicyclo[2.2.1]hept-5-en-2-alkoxides derived from alcohols 2–9 at 30° in hexamethylphosphoric triamide (HMPA) afford 1-(3′-cyclopentenyl)-2-alkanones 10–19via heterolytic C(1), C(2)-allylic bond cleavage in the substrate alkoxide followed by intramolecular protonation of the resultant transient allylic anion.
在六甲基
磷酸三酰胺(HMPA)中于30°衍生自2-9的醇的2-取代的双环[2.2.1]庚-5-烯-2-烷氧基
钾可提供1-(3'-
环戊烯基)-2-链烷酮10- 19通过杂化C(1),C(2)-烯丙基键在底物醇盐中裂解,然后分子内质子化所得的瞬时烯丙基阴离子。