Abstract
In the presence of chiral thiourethane ligands [Cu(MeCN) 4]BF 4 forms active catalysts for the conjugate addition of MeMgBr, ZnEt 2 and AlR 3 (R = Me, Et) to non-3-en-2-one, hept-3-en-2-one, and 5-methylhex-3-en-2-one. Enantioselectivities of up to 51% are realised for these difficult substrates; for cyclohex-2-enone an e.e. of 42% is attained.
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