Trifluoromethyl‐substituted pyrazoles were synthesized via 1,3‐dipolar cycloaddition from sydnones 2a‐j and 1‐aryl‐3,3,3‐trifluoro‐propynes 5a‐f. The regioselectivity of the reaction and the spectroscopic characteristics of the products are discussed.
The preparation of silica-supported poly-L-leucine has been studied under a variety of reaction conditions leading to an efficient procedure for the preparation of material suitable for use in the Julia ´-Colonna asymmetric epoxidation reaction.
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