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The Ti(IV) enolates derived from alpha-diazo-beta-keto esters or ketones efficiently add to TiCl4-activated N-tosylimines to give delta-N-tosylamino substituted alpha-diazo-beta-keto carbonyl compounds. The diazo decomposition of the addition products occurs under Rh2(OAc)4-catalyzed or photoinduced conditions to afford pyrrole or gamma-lactam derivatives, both in high yields.
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Dong et al. (2006) studied this question.
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