The highly strained and reactive 2H-azirines have been extensively studied for various synthetic purposes, such as ring expansion reactions, 1,2 cycloaddition reactions,2,3 and preparation o f functionalized amines3 and substituted aziridines.1 ~3 The applicability o f these small-ring heterocycles is strongly deter mined by the nature of the substituents.2,3 2tf-Azirine 2-car boxylic acids and esters are of particular interest as they form an entrée to e.g. nonprotein amino acids.4 Moreover, azirinom ycin5 (1, R = M e, R' = H), disydazirine6,7 (1, R = trans-n-C n iib C H^C H , R/ = M e), and antazirine7 (1, R = trans-

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