A variety of methods for SN2 substitution at sterically hindered 9-bromocamphor (2) was tested for the preparation of 9-mercaptocamphor (1), a fragrant compound with a roasty note reminiscent of onion. All reagents failed, with the notable exception of potassium thioacetate in N-methylpyrrolidone (for 3 days at 180°C). The peculiar reactivity pattern of both neopentyl-type 2 and 9,10-dibromocamphor (9) involves surprisingly smooth substitution reactions where strain is released. Thus, 9 was transformed into tricyclic 9,10-epithiocamphor 12, as established by X-ray analysis.
Hutchinson, John H.; Money, Thomas, Canadian Journal of Chemistry, 1987, vol. 65, p. 1 - 6
作者:Hutchinson, John H.、Money, Thomas
DOI:——
日期:——
Martinez, Antonio Garcia; Vilar, Enrique Teso; Fraile, Amelia Garcia, Synlett, 2004, # 1, p. 134 - 136
作者:Martinez, Antonio Garcia、Vilar, Enrique Teso、Fraile, Amelia Garcia、Cerero, Santiago Moya de la、Morillo, Cristina Diaz、Morillo, Rocio Perez
DOI:——
日期:——
Enantiospecific Access to Various C(9),C(10)-Disubstituted Camphors: Scope and Limitations
作者:Antonio García Martínez、Enrique Teso Vilar、Amelia García Fraile、Santiago de la Moya Cerero、Cristina Díaz Morillo、Rocío Pérez Morillo
DOI:10.1021/jo049462b
日期:2004.10.1
The valuable chiral sources C(9),C(10)-disubstituted camphors can be enantiospecifically obtained from the corresponding C(9)-substituted camphors by a general and straightforward synthetic method. This method involves the electrophilic treatment of a key 2-methylenenorbornan-1-ol intermediate, followed by a controlled tandem carbon-carbon double-bond addition-Wagner-Meerwein rearrangement of the norbornane framework. Discussion of the results presented suggests possible extensions and limitations of the methodology used. The feasibility of this method has been exemplified by the highly efficient enantiospecific preparation of several interesting C(9)-halogen-, C(10)-halogen, O-S-, or Se-substituted camphors.
Dadson, William M.; Lam, Mayda; Money, Thomas, Canadian Journal of Chemistry, 1983, vol. 61, p. 343 - 346
作者:Dadson, William M.、Lam, Mayda、Money, Thomas、Piper, Susan E.