Iodide salts of certain rhodium complexes of asymmetric...

Details Iodide salts of certain rhodium complexes of asymmetric... Iodide salts of certain rhodium complexes of asymmetric...

C - Chemistry, Metallurgy

07

D

260/314.8

C07D 233/70 (2006.01)

Patent

CA 1100512

ABSTRACT OF THE DISCLOSURE A method for the attainment of enhanced enantioselectivity in the reduction of 3-acyl derivatives of 1-(2-alkoxyethyl)-4-phenyl- imidazolin-2-ones to the optically active 3-acyl derivatives of 1-(2- alkoxyethyl)-4-phenyl-2-imidazolidones for use in the direct manufacture of levamisole, (-), 2, 3, 5, 6-tetrahydro-6-phenylimidazo-[2,1-b]-thiazole, useful as an anthelmintic has been discovered. The method involves the preferred use of iodide salts of Rh(I) complexes of optically active bis- tertiary phosphines of the formula: Image to achieve maximum enantioselectivity. The methods for preparing the iodide salts are disclosed.

303716

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