Direct C-allylation of aryl-alkyl/glycosyl carbinols:: Facile synthesis of C-linked carbo-β2- γ2- δ2-amino acids

(a)Reagents and conditions: (a) Mg, 4-bromoanisole, dry THF, reflux; (b) allyltrimethylsilane (2 equiv), ZrCl4 (2 mol %), CH3CN, rt; (c) several reagents.