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Adical 56 or four-membered Cu(III) species 57 to type 78, which undergoes a reductive elimination to amino ester 79 with regeneration in the Cu(I) catalyst. The cyclization of compound 79 offers the hydantoin (75) (Scheme 41).four. CONCLUSIONS AND OUTLOOK Direct diamination of olefins delivers a CB2 Antagonist Formulation simple approach to vicinal diamines, which are crucial functional and structural moieties present in a selection of L-type calcium channel Activator Synonyms biologically active molecules and chiral catalysts. As summarized within this Account, we have created a variety of Pd(0)- and Cu(I)-catalyzeddx.doi.org/10.1021/ar500344t | Acc. Chem. Res. 2014, 47, 3665-Accounts of Chemical Research diamination processes for olefins with di-tert-butyldiaziridinone (1), di-tert-butylthiadiaziridine 1,1-dioxide (two), and 1,2-di-tertbutyl-3-(cyanimino)-diaziridine (three) as nitrogen sources by means of N- N bond activation, permitting direct installation of two nitrogens onto a C-C double bond. The Pd(0)-catalyzed diamination of conjugated dienes occurs regioselectively in the internal double bond with di-tert-butyldiaziridinone (1) or di-tert-butylthiadiaziridine 1,1-dioxide (2), likely involving a four-membered Pd(II) species. The asymmetric diamination course of action has also been achieved, giving imidazolidinones and cyclic sulfamides in high ee’s. The Pd(0)-catalyzed diamination of terminal olefins happens at the allylic and homoallylic carbons with di-tertbutyldiaziridinone (1) as nitrogen supply by means of an in situ generated diene intermediate. A very enantioselective process has also been created for this C-H diamination reaction. With di-tert-butylthiadiaziridine 1,1-dioxide (2) as nitrogen supply, the two nitrogens are introduced onto the terminal carbons via a dehydrogenative diamination procedure. Complementary diamination processes have also been developed with Cu(I) catalysts. The Cu(I)-catalyzed diamination of conjugated dienes occurs regioselectively at either the terminal or internal double bond according to the reaction situations, likely involving a Cu(II) nitrogen radical or a four-membered Cu(III) species, respectively, by way of two mechanistically distinct pathways. Encouraging ee’s have already been obtained for the Cu(I)-catalyzed terminal diamination. The Cu(I)-catalyzed diamination also can be extended to numerous terminal olefins with nitrogen sources 1-3 by way of a radical mechanism, giving ready access to many different imidazolidinones, cyclic sulfamides, and cyclic guanidines in very good yields. The Pd(0)- and Cu(I)-catalyzed diaminations described herein exhibit several favorable options: (1) Normally, the diamination proceeds cleanly in higher regio- and diastereoselectivity using a broad substrate scope. (two) Very enantioselective catalytic diamination processes have already been created, which had previously been very difficult. (three) The diamination generally proceeds beneath mild situations with no stoichiometric external oxidants essential. (4) The reactions are operationally uncomplicated, amenable to gram scale, and potentially applicable towards the synthesis of biologically active vicinal diaminecontaining molecules. The diaziridinone and associated compounds have been shown to become highly helpful agents for the diamination reactions. Their exceptional and versatile reactivity would provide fantastic possibilities for the improvement of new reaction processes.Articlefrom Arizona State University in 2008. He obtained his Ph.D. degree from Colorado State University with Professor Yian Shi in 2014. Haifeng Du was born in Jilin, Chi.