Synthesis of Alkenyl Sulfides Through the Iron-Catalyzed Cross-Coupling Reaction of Vinyl Halides with Thiols
作者:Yun-Yung Lin、Yu-Jen Wang、Che-Hung Lin、Jun-Hao Cheng、Chin-Fa Lee
DOI:10.1021/jo3008397
日期:2012.7.20
here the iron-catalyzedcross-couplingreaction of alkyl vinyl halides with thiols. While many works are devoted to the coupling of thiols with alkyl vinyl iodides, interestingly, the known S-vinylation of vinylbromides and chlorides is limited to 1-(2-bromovinyl)benzene and 1-(2-chlorovinyl)benzene. Investigation on the coupling reaction of challenging alkyl vinylbromides and chlorides with thiols
Catalytic 1,4-Rhodium(III) Migration Enables 1,3-Enynes to Function as One-Carbon Oxidative Annulation Partners in CH Functionalizations
作者:David J. Burns、Hon Wai Lam
DOI:10.1002/anie.201406072
日期:2014.9.8
1,3‐Enynes containing allylic hydrogens cis to the alkyne are shown to act as one‐carbon partners, rather than two‐carbon partners, in various rhodium‐catalyzedoxidativeannulations. The mechanism of these unexpected transformations is proposed to occur through double CH activation, involving a hitherto rare example of the 1,4‐migration of a RhIII species. This phenomenon is general across a variety
The reaction of 5-hexynyl tosylate (3a) with alkynyllithium (RC=CLi; R Ph, TMS) gives enynes 5 and 6. The reaction proceeds through a mechanism involving a novel exo-type cyclization of 6-lithiod-hexynyl tosylate to form cyclopentylidene carbene. Enyne 6 is produced by the addition of RC=CLi to the carbene, whereas rearrangement of the carbene to cyclohexyne followed by carbolithiation with RC=CLi gives enyne 5. The formation of cyclopentylidene carbene and cyclohexyne as intermediates is clearly demonstrated by trapping experiments with cyclohexene land triethylsilane) and with 1,3-diphenylisobenzofuran, respectively. Alkynyllithiums derived from 3-butynyl and 6-heptynyl p-fluorobenzenesulfonates (19a,b) undergo a similar exo-type cyclization to give cyclopropylidene and cyclohexylidene carbenes, respectively.
Normant,H.; Villieras,J., Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1964, vol. 259, p. 1150 - 1152
作者:Normant,H.、Villieras,J.
DOI:——
日期:——
Villieras,J., Bulletin de la Societe Chimique de France, 1967, p. 1511 - 1520