5-(2-Nitroalkyl)isopropylidene malonate and 5,5'-(2-nitro-1,3-propylidene)bis(isopropylidene malonate) were easily synthesised by onepot tandem reaction of substituted Meldrum's acids with the aminomethylating agent (Me2NCH2OAc) and nitroalkanes in the presence of a weak acid, such as acetic acid.