2017
DOI: 10.1021/jacs.7b05327
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Cobalt Catalysis for Enantioselective Cyclobutanone Construction

Abstract: Over the past 40 years, intramolecular hydroacylation has favored five-membered rings, in preference to four membered rings. Herein, we report a catalyst derived from earth-abundant cobalt that enables preparation of cyclobutanones, with excellent regio-, diastereo-, and enantiocontrol, under mild conditions (2 mol % catalyst loading and as low as 50 °C).

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Cited by 88 publications
(44 citation statements)
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“…[14] Furthermore,i tw ould also allow access to polysubstituted cyclobutanones,f or which catalytic enantioselective approaches remain scarce. [15] The expected keto-boronate products can undergo bidirectional functionalizations,making them valuable medicinal chemistry intermediates.…”
mentioning
confidence: 99%
“…[14] Furthermore,i tw ould also allow access to polysubstituted cyclobutanones,f or which catalytic enantioselective approaches remain scarce. [15] The expected keto-boronate products can undergo bidirectional functionalizations,making them valuable medicinal chemistry intermediates.…”
mentioning
confidence: 99%
“…[52] Mithilfe eines Cobaltkatalysators mit (S,S)-BDPP (50)a ls Ligand gelang der Gruppe von Dong eine Inversion der Regioselektivitäth in zu gespannten viergliedrigen Ringen 61 statt der fünfgliedrigen Regioisomere.Z udem führte erhçhter sterischer Einfluss an der a-Position bevorzugt zur Entstehung des viergliedrigen Rings statt der fünfgliedrigen Analoga. [52] Mithilfe eines Cobaltkatalysators mit (S,S)-BDPP (50)a ls Ligand gelang der Gruppe von Dong eine Inversion der Regioselektivitäth in zu gespannten viergliedrigen Ringen 61 statt der fünfgliedrigen Regioisomere.Z udem führte erhçhter sterischer Einfluss an der a-Position bevorzugt zur Entstehung des viergliedrigen Rings statt der fünfgliedrigen Analoga.…”
Section: Methodsunclassified
“…In 2017, Dong disclosed cobalt-catalyzed enantioselective intramolecular hydroacylation of α,α-bis(allyl)aldehydes 32, leading to cyclobutane derivatives 33 (Scheme 7). 16 A catalyst generated upon reduction of [(S,S)-BDPP]Co-Cl 2 with Zn promoted the desymmetrization process to afford cyclobutane 33, bearing an all-carbon quaternary center, with high enantio-and diastereoselectivities, in preference to the regioisomeric cyclopentanone product 34. A comparable performance was attained using Et 2 Zn as the reductant instead of Zn.…”
Section: C-h Functionalizationmentioning
confidence: 99%