Abstract
Double chloride abstraction from [RuCl2 (PNNP)] [PNNP = (S ,S )-N ,N ′-bis[o -(diphenylphosphino)benzylidene]cyclohexane-1,2-diamine] gives
the elusive dicationic adduct [Ru(OEt)2 (PNNP)]²+ which
catalyzes the [2+2] cycloaddition of
cyclic alkylidene β-keto esters with a variety of ynamides
to produce bicyclo[3.2.0]heptane-based enamides
with high yields and enantioselectivity. The structural
features of these products are discussed and selected examples are
converted into highly modular diene, phosphite-alkene, and diphosphite
derivatives, which were tested as bidentate ligands with Rh(I),
Ir(I), and Pd(II).
Key words
asymmetric catalysis - biaryls - cycloaddition - bicyclic compounds - ligands - phosphorus - ruthenium
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