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[摘要]:A catalytic asymmetric conjugate allylation was successfully developed to synthesize potential pharmacologically active 4-allyl-2-oxochroman skeletons. A dual activation strategy was employed by using N,N'-dioxide-Yb(OTf)(3) to activate coumarins and using (CuOTf)(2)center dot C(7)H(8) to activate tetraallyltin via transmetalation, respectively. Good yields and enantioselectivities were obtained under mild conditions. |
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