AgOAc catalyst, cycloaddition with

Grigg and coworkers have recently shown that AgOAc is a catalyst of choice for the cycloaddition of isocyanoacetates with olefins possessing conjugated electron-withdrawing groups to give <5 - or <5 -pyrrolines [14], For instance, the reaction of... 

The 1,3-dipolar cycloaddition reaction of non-stabilized azomethine ylides, derived from A-alkyl-cf-amino acids, with 3-nitro-2-trifluoro(trichloro)methyl-2//-chromenes produced l-benzopyrano[3,4-c]pyrrolidines in good yields." AgOAc-catalysed asymmetric 3 + 2-cycloaddition reactions of azomethine ylides with e-deficient alkenes yielded enr/o-adducts with up to 99% ee. New chiral ferrocenyl P,N-ligands possessing a benzoxazole ring as the Af-donor (35) are effective asymmetric catalysts... 

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