Chinese Journal of Organic Chemistry >
Copper-Catalyzed Asymmetric Allyl Alkylation Using Grignard Reagents under Continuous Flow
Received date: 2023-03-20
Revised date: 2023-04-24
Online published: 2023-06-14
Supported by
Shenzhen Basic Research Foundation(JCYJ20190806142203709); Shenzhen Basic Research Foundation(JSGG20191129114029286); Shenzhen Basic Research Foundation(JSGG20201103153807021); Shenzhen Basic Research Foundation(GXWD2022081117373600); Guangdong Basic and Applied Basic Research Foundation(2021A1515110366); China Postdoctoral Science Foundation(2022M720951); Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application
Continuous flow reactors were used to explore the copper-catalyzed asymmetric allyl alkylation (AAA) reactions of Grignard reagents under milder conditions for the first time. After continuous optimization, a 2-channel stainless steel broken-line continuous flow reactor was used to achieve a copper-catalyzed AAA reaction of various Grignard reagents at –20~–10 ℃ under very short reaction retention time of 0.6 s furnishing the corresponding products in 82%~99% yields with moderate to good enantioselectivity. Furthermore, the copper-catalyzed AAA reaction of 3-bromocyclohexene with methylmagnesium bromide was scaled up under a continuous flow process with continuous feeding for 34 min affording 0.968 g of (S)-3-methylcyclohex-1-ene with 98.7% yield and 96.6% ee.
Xiao Song , Jing Qing , Jun Li , Xuelei Jia , Fusong Wu , Junrong Huang , Jian Jin , Hengzhi You . Copper-Catalyzed Asymmetric Allyl Alkylation Using Grignard Reagents under Continuous Flow[J]. Chinese Journal of Organic Chemistry, 2023 , 43(9) : 3174 -3179 . DOI: 10.6023/cjoc202303027
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