杂环环丙并[ ˚F ]茚19合成通过二烯环加成10到环丙烯11A和随后的碱诱导的芳构化。虽然19是可分离的,但寿命很短,但oxa类似物18在其制备所需的条件下会分解。杂环部分饱和的二氟衍生物14和15可通过环加成法获得,但是相应的二氯化物也不可分离。通过环加成获得C(4)上带有取代基的环丙[ f ]茚。22b为1-溴-2-氯环丙烯。该序列的关键步骤是环加合物23b到酮27a的两次Curtius降解。虽然醇27b的芳构化提供了环丙[ f ]茚满醇28b,但反应失败并变为27a。试图通过甲磺酸盐28d将28b转化为1,3-二氢环丙[ f ]茚(25)的尝试失败了。
Intramolecular Carbolithiation of 2,6-Dilithio-1,6-heptadienes: An Experimental and Theoretical Study
作者:Roberto Sanz、José M. Ignacio、Miguel A. Rodríguez、Francisco J. Fañanás、José Barluenga
DOI:10.1002/chem.200601863
日期:2007.6.4
6-heptadiene (14) has been studied experimentally. A series of ab initio molecular-orbital calculations on the course of the reaction were carried out and the results were compared to those for the corresponding intramolecularcarbolithiation of an isolated double bond. The Li-C interactions found in the transition state by this theoreticalstudy support a carbolithiation pathway for the cyclization of
Palladium-Catalyzed Inter- and Intramolecular Coupling Reactions of Aryl and Vinyl Halides Mediated by Indium
作者:Phil Ho Lee、Dong Seomoon、Kooyeon Lee
DOI:10.1021/ol047567v
日期:2005.1.1
Treatment of aryl and vinylhalides with 50 mol % of 100 mesh indium, 2.5 mol % of Pd-C, and 1.5 equiv of LiCl under mild conditions (DMF, 100 degrees C, 1-3 h) could produce coupling products efficiently in good to excellent yields in which the C(sp2)-C(sp2) bond was formed. This reagent worked equally well with both intermolecular and intramolecular coupling reactions, producing a variety of biaryls
Palladium catalysed intra- and inter-molecular coupling of vinyl halides. Regiospecific formation of 1,3-dienes
作者:Ronald Grigg、Paul Stevenson、Tanachat Worakun
DOI:10.1039/c39850000971
日期:——
Palladiumcatalysedcoupling of vinyl bromides proceeds in good yield under mild conditions provided sufficient triarylphosphine and potassium carbonate are present to regenerate the active palladium(0) species; double bond isomerisation is not observed under these conditions.