2014
DOI: 10.1021/ja510419z
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Copper-Catalyzed Diastereo- and Enantioselective Desymmetrization of Cyclopropenes: Synthesis of Cyclopropylboronates

Abstract: A novel Cu-catalyzed diastereo- and enantioselective desymmetrization of cyclopropenes to afford nonracemic cyclopropylboronates is described. Trapping the cyclopropylcopper intermediate with electrophilic amines allows for the synthesis of cyclopropylaminoboronic esters and demonstrates the potential of the approach for the synthesis of functionalized cyclopropanes.

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Cited by 208 publications
(98 citation statements)
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“…of up to 93:7 under similar reaction conditions. Terminal alkenes, such as 1‐methylenecyclopropanes, and internal ones, such as cyclopropenes and bicyclicalkenes (e.g., oxa‐ and azabenzonorbornadienes), all were effective after slight tuning of the reaction conditions. When the special vinylsilanes and vinylborons were used as the substrates, this reaction also took place readily under similar reaction conditions to produce the corresponding β‐boryl‐α‐aminosilanes and β‐boryl‐α‐aminoboronic acid derivatives in good‐to‐high yields.…”
Section: Copper Catalysismentioning
confidence: 99%
“…of up to 93:7 under similar reaction conditions. Terminal alkenes, such as 1‐methylenecyclopropanes, and internal ones, such as cyclopropenes and bicyclicalkenes (e.g., oxa‐ and azabenzonorbornadienes), all were effective after slight tuning of the reaction conditions. When the special vinylsilanes and vinylborons were used as the substrates, this reaction also took place readily under similar reaction conditions to produce the corresponding β‐boryl‐α‐aminosilanes and β‐boryl‐α‐aminoboronic acid derivatives in good‐to‐high yields.…”
Section: Copper Catalysismentioning
confidence: 99%
“…Mehrere Arbeitsgruppen berichteten zudem über das Abfangen des bei der Kupfer-katalysierten 1,4-Borylierung entstehenden Kupferenolats mit Aldehyden und Ketonen in sowohl inter-a ls auch intramolekularen Prozessen gemäßeiner Aldolreaktion. [59,60] Im Rahmen interessanter Weiterentwicklungen von Kupfer-katalysierten asymmetrischen Protoborierungsreaktionen berichteten Ito und Mitarbeiter vor kurzem über mehrere Untersuchungen zur Kupfer-katalysierten enantioselektiven borylierenden Funktionalisierung von Heterocyclen. Hoveyda und Mitarbeiter berichteten 2009 über die enantioselektive Kupfer-katalysierte Protoborierung von arylsubstituierten Alkenen (ohne weitere Aktivierung durch eine konjugierte Carbonylfunktion).…”
Section: Angewandte Chemieunclassified
“…Tortosa and Rubin were able to find chiral copper or rhodium complexes which afforded the corresponding enantioenriched cyclopropanes. 56,58 …”
Section: Introductionmentioning
confidence: 99%