SRi A

H R3

R2 R

R2 R

Scheme 1.12 Boron chiral auxiliaries for aldheyde allylations

Jtbh

17a R = Cl or OTf 18a R = Cl or OTf 19 Ar = Ph 20 R = Ph Ri = H

17b R = H 18b R = H 19 a Ar = 3,5-(CF3)-Ph 20 a R = H, Ri = TMS

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