Solvent-Free Organocatalytic Mukaiyama-Michael Addition of 2-Trimethylsilyloxy Furan to Nitroalkenes Catalyzed by Brønsted Acids

The first organocatalytic Mukaiyama-Michael addition of 2-trimethylsilyloxy furan to nitroalkenes was promoted by Brønsted acids under solvent-free conditions. The conjugate addition took place in moderate to good yields with variously substituted nitroalkenes. The procedure is operationally simple and no workup is required.