Starting with camphene-1-carboxylic acid (III), both C13-keto acid (II), the key degradation product of isolongifolene, and (±)-isolongifolene itself, have been synthesized by an unambiguous route.
Stereochemical studies of tricyclo[6.2.1.O.1·6]undecanes—II
作者:C.W. Greengrass、R. Ramage
DOI:10.1016/0040-4020(75)80071-8
日期:1975.1
The stereochemistry of epoxidation and hydroboration of isolongifolene has been elucidated by comparison with the chemistry of the C2-desmethyl epoxides and their transformation products. The main factors controlling the stereochemistry of epoxidation of isolongifolene are the bicycloheptyl moiety and the C-2β methyl substituent.
作者:T.S. Santhanakrishnan、R.R. Sobti、U.R. Nayak、Sukh Dev
DOI:10.1016/s0040-4020(01)97859-7
日期:1970.1
Isolongifolene epoxide undergoes novel rearrangements on treatment with 1% HCl in CHCl3 or on being exposed to active adsorbent (Al2O3, SiO2-gel). The latter reaction leads to tetracarbocylic derivatives. These reactions fully substantiate the stereochemistry assigned earlier to isolongifolene epoxide.
在用1%HCl / CHCl 3溶液处理或暴露于活性吸附剂(Al 2 O 3,SiO 2凝胶)的情况下,异戊二烯环氧化物会发生新的重排。后者反应产生四碳环衍生物。这些反应充分证实了较早分配给异长叶环氧化物的立体化学。
Sesquiterpene Cyclizations inside the Hexameric Resorcinarene Capsule: Total Synthesis of δ‐Selinene and Mechanistic Studies
作者:Qi Zhang、Konrad Tiefenbacher
DOI:10.1002/anie.201906753
日期:2019.9.2
capsule was utilized as an artificial cyclase to catalyze the cyclization of sesquiterpenes. With the cyclization reaction as the key step, the first total synthesis of the sesquiterpene natural product δ-selinene was achieved. This represents the first total synthesis of a sesquiterpene natural product that is based on the cyclization of a linear terpene precursor inside a supramolecular catalyst
Isolongifolene has been systematically degraded to a bisnor-keto acid, the spectral characteristics of which are in full accord with the structure (II) assigned earlier to isolongifolene.