The 1,3-dipolar cycloaddition of linear azido alkynes derived from protected β-amino esters proceeds via diastereomeric differentiation to provide trans-disubstituted triazolodiazepines in good yields.
2-substituted-3-methoxycarbonyl pyrroles has been developed. Diverse SES protected α-methylene β-aminoesters were obtained by a 3-component aza-Baylis−Hillman reaction. Diversity arose from the aryl aldehydes which can be used in this reaction. N-Alkylation with allyl bromide under mild conditions provided the corresponding dienes. These substituted dienes were cyclized by ring closing metathesis at room