2002
DOI: 10.1016/s0040-4039(01)02098-6
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Ethylene metathesis of sulfur-containing alkynes

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Cited by 50 publications
(27 citation statements)
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“…Use of thiol ester protecting groups proved successful in attenuating the basicity of the sulfur lone pair, resulting in a successful ethylene cross-metathesis (entries 8-11). 82 Thiol acetates and thiol benzoates were prepared by Mitsunobu reaction of the corresponding alkynols. In entry 10, it can be seen that the first-generation carbene 1 as well as the second-generation complex 2 did not perform.…”
Section: Ceym With Ethylenementioning
confidence: 99%
“…Use of thiol ester protecting groups proved successful in attenuating the basicity of the sulfur lone pair, resulting in a successful ethylene cross-metathesis (entries 8-11). 82 Thiol acetates and thiol benzoates were prepared by Mitsunobu reaction of the corresponding alkynols. In entry 10, it can be seen that the first-generation carbene 1 as well as the second-generation complex 2 did not perform.…”
Section: Ceym With Ethylenementioning
confidence: 99%
“…Even though RCM reactions are routinely performed in the presence of dithiane ring systems, [35] it is believed the difficulties encountered with the present RCM reactions are most likely attributed to the close proximity of sulfur atoms to the reaction centre allowing sulfur atom co-ordination to ruthenium thus preventing catalyst turnover. [36] Having established the carbon backbone in lactone 52, deprotection cyclisation strategies could now be probed. The dithiane deprotection approach, investigated first, proceeded without incident giving ketone 57 in 95 % yield.…”
Section: Wwwchemeurjorgmentioning
confidence: 99%
“…[119] Sulfide und Thiole sind mit 6 nicht kompatibel, da das "weiche" Schwefelatom vermutlich stark an das Rutheniumzentrum koordiniert wird und somit als Katalysatorgift wirkt. Demgegenüber wirken die Komplexe 3 und 4 a mit ihrem stark sbasischen NHC-Liganden als weitaus schwächere LewisSäuren und Chelatbildner, sodass En-In-Metathesen mit Propargylthioestern in Gegenwart von 3 in hohen Ausbeuten verliefen, während mit 6 nahezu keine Umsetzung stattfand.…”
Section: Kreuzmetathese Von Olefinenunclassified