Tetrahedron Letters p. 1767 - 1770 (1999)
Update date:2022-08-17
Topics:
Bennett, Simon M.W.
Brown, Stephen M.
Muxworthy, James P.
Woodward, Simon
In the presence of chiral thiourethane ligands [Cu(MeCN)4]BF4 forms active catalysts for the conjugate addition of MeMgBr, ZnEt2 and AlR3 (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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