2006
DOI: 10.1021/ja061344d
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Gold(I)-Catalyzed Synthesis of Dihydropyrans

Abstract: A trinuclear gold(I)-oxo complex, [(Ph3PAu)3O]BF4, serves as the catalyst for the stereocontrolled synthesis of 2-hydroxy-3,6-dihydropyrans from propargyl vinyl ethers. Importantly, the rearrangement proceeds with excellent diastereoselectivity, and the rearrangement of chiral nonracemic propargyl vinyl ethers proceeds with excellent chirality transfer to furnish enantioenriched pyrans. Additionally, the reaction is amenable to the synthesis of spiroketals from appropriately functionalized precursors. In this … Show more

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Cited by 204 publications
(93 citation statements)
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“…Recently, Toste and co-workers reported the assembly of dihydropyrans using a tandem Claisen rearrangement/heterocyclization sequence shown in Scheme 67. [49] Subjection of propargyl vinyl ether 324 to [(PPh 3 PAu) 3 O]BF 4 afforded aldehyde 325 by the same mechanism as shown in Scheme 66. Subjection of 325 to the same catalyst, but in wet dioxane, resulted in the formation of dihydropyran 326.…”
Section: Formation Of Allenes Via a [33] Rearrangementmentioning
confidence: 95%
“…Recently, Toste and co-workers reported the assembly of dihydropyrans using a tandem Claisen rearrangement/heterocyclization sequence shown in Scheme 67. [49] Subjection of propargyl vinyl ether 324 to [(PPh 3 PAu) 3 O]BF 4 afforded aldehyde 325 by the same mechanism as shown in Scheme 66. Subjection of 325 to the same catalyst, but in wet dioxane, resulted in the formation of dihydropyran 326.…”
Section: Formation Of Allenes Via a [33] Rearrangementmentioning
confidence: 95%
“…(6)]. [273] Ist hingegen kein Alkohol vorhanden, finden Propargyl-Claisen-Umlagerungen statt, was die Freisetzung des Katalysators aus einer reaktiven Zwischenstufe vom Typ 282 erfordert (Schema 55). [274][275][276] Damit verwandt sind auch goldkatalysierte Conia-EnReaktionen von aktivierten Methylenverbindungen (Malonate, b-Ketoester) mit Alkinen, die sowohl als exo-als auch als endo-Carbocyclisierungen ablaufen können (Schema 56).…”
Section: A Fürstner Und P W Daviesunclassified
“…Tostes Arbeitgruppe prüfte auch die Reaktivität von Allylvinylethern. [166] Ausgehend von ihren Befunden zu einer Des Weiteren stellte sich heraus, dass eine Tandem-Cyclisierung/Pinakolumlagerung durch einen Au I -Katalysator vermittelt werden kann. [167] So cyclisierte das 3-Silyloxy-1,5-enin 435 glatt, und die anschließende Pinakolumlagerung in Gegenwart von 2-Propanol bei Raumtemperatur in CH 2 Cl 2 lieferte das Cyclopenten 436 in sehr guter Ausbeute [Gl.…”
Section: Enin-tandemreaktionenunclassified