Enediynes in 11-Membered Rings. Synthesis, Structure, and Reactivity of Highly Strained but Unusually Stable Macrocycles
作者:Holger Wandel、Olaf Wiest
DOI:10.1021/jo0106041
日期:2002.1.1
observed C(1)-C(6) distances of the enediyne moiety in the oxygen- and sulfur-containing eleven-membered rings are quite short with 3.44 and 3.50 A, respectively, indicating the highly strained nature of these compounds. Isodesmic calculations at the B3LYP/6-31G level of theory indicate a strain energy of 8.2 and 5.8 kcal/mol, respectively. Despite the highly strained ring system, the compounds were found