1,3-Dipolar Cycloaddition with Diazo Groups: Noncovalent Interactions Overwhelm Strain.

ABSTRACT: Like azides, diazoacetamides undergo 1,3-dipolar cycloadditions with oxanorbornadienes (OND) in a reaction that is accelerated by the relief of strain in the transition state. The cycloaddition of a diazoacetamide with unstrained ethyl 4,4,4-trifluoro-2-butynoate is, however, 35-fold faster than with the analogous OND because of favorable interactions with the fluoro groups. Its rate constant (k = 0.53 M(-1) s(-1) in methanol) is comparable to those of strain-promoted azide-cyclooctyne cycloadditions.

SUBMITTER: Gold B 

PROVIDER: S-EPMC5148626 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature