Challenging the Molecular Parameters of Vetiver: Can 4,5-Dimethyl-3-(3′-methylbut-1′-en-2′-yl)-4-phenylcyclopent-2-en-1-one Mimic Zizaenones in Structure and Odor?
作者:Patrick Pfaff、Halima Mouhib、Philip Kraft
DOI:10.1002/ejoc.201900163
日期:2019.4.24
successful on a classical Stork–Danheiser route, the simplified target structure, designed to be confined by London dispersion forces to mimiczizaenones, only possesses a weak woody odor but no typical vetiver character. So, the question of the ultimate vetiver lead structure and the race for an easily accessible synthetic vetiver odorant remain open.
The Tandem Radical Cyclization Approach to Angular Triquinanes
作者:Dennis P. Curran、Shen-Chun Kuo
DOI:10.1016/s0040-4020(01)87744-9
日期:1987.1
Modelsstudies and the total synthesis ofsilphiperfol-6-ene (4, seven steps) and 9-episilphiperfol-6-ene (14, five steps) are reported. The use of a tandem radicalcyclization permits rapid construction of the requisite tricyclic nucleus. In the most direct approach, the key tandem cyclization (18 → 19) produces the C-9 epimer as the major product. In a modified approach, cyclization of the dioxolane
The geometrical constraints of the fluoride-initiated and Lewis acid-catalyzed intramolecular addition of allylsilanes to enone systems were shown to be governed by kinetic-ring-size preferences. Molecules containing adjacent quaternary carbon atoms can be prepared using this method.
Assembly of multicyclic isoquinoline scaffolds from pyridines: formal total synthesis of fredericamycin A
作者:Fang-Xin Wang、Jia-Lei Yan、Zhixin Liu、Tingshun Zhu、Yingguo Liu、Shi-Chao Ren、Wen-Xin Lv、Zhichao Jin、Yonggui Robin Chi
DOI:10.1039/d1sc02442f
日期:——
typically starts with benzene derivatives as substrates with the assistance of acids or transition metals. Disclosed here is a concise approach to prepare isoquinoline analogues by starting with pyridines to react with β-ethoxy α,β-unsaturated carbonyl compounds under basic conditions. Multiple substitution patterns and a relatively large number of functional groups (including those sensitive to acidic
A new approach for the formation of fused cyclooctane or cyclohexane rings
作者:George Majetich、Ken Hull、Richard Desmond
DOI:10.1016/s0040-4039(00)94902-5
日期:1985.1
The intramolecular regioselective addition of unsymmetrical allylsilanes to conjugated dienones is shown to permit facile entry into 5-6, 6-6, 5-8, and 6-8 bicyclic ring systems.