Umani-Ronchi

D. Braga, A. Rjpamonti, D. SaVoia, C. Trombini and A. Umani-Ronchi, J. Chem. Soc., Dalton Trans., 2026-8 (1979). 

In contrast, Cozzi and Umani-Ronchi found the (salen)Cr-Cl complex 2 to be very effective for the desymmetrization of meso-slilbene oxide with use of substituted indoles as nucleophiles (Scheme 7.25) [49]. The reaction is high-yielding, highly enantioselective, and takes place exclusively at sp2-hybridized C3, independently of the indole substitution pattern at positions 1 and 2. The successful use of N-alkyl substrates (Scheme 7.25, entries 2 and 4) suggests that nucleophile activation does not occur in this reaction, in stark contrast with the highly enantioselective cooperative bimetallic mechanism of the (salen)Cr-Cl-catalyzed asymmetric azidolysis reaction (Scheme 7.5). However, no kinetic studies on this reaction were reported. 

G. Cainhlli, M. Panunzio u. A. Umani-Ronchi, Tetrahedron Letters 1973, 2491. 

Bellucci, C. Cozzi. P.G. Umani-Ronchi. A. Tetrahedron Lett., 1995, 36, 7289... 

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