铜催化格氏试剂的不对称烯丙基烷基化连续流反应

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.