摘要:
Reformatsky reactions of methyl 1-bromocyclohexanecarboxylate and methyl 1-bromocyclopentanecarboxylate with 2-aryl-2-oxoacetaidehydes involve both carbonyl groups of the latter and result in formation of 3a-aryl-3,3:6,6-bis(pentamethylene)- and 3a-aryl-3,3:6,6-bis(tetramethylene)tetrahydrofuro-[3,2-b]furan-2,5-diones. The reaction with 2-(2,4-dimethylphenyl)-2-oxoacetaldehyde gives acyclic products, methyl 1-[1-hydroxy-2-(2,4-dimethylphenyl)-2-oxoethyl]cyclohexanecarboxylate and methyl 1-[1-hydroxy-2(2,,4-dimethylphenyl)-2-oxoethyllcyclopentanecarboxylate, while with benzil methyl 1-(4-hydroxy-1-oxo-3,4-diphenyl-2-oxaspiro[4.5]dec-3-yl)cyclohexanecarboxylate and methyl 1-(4-hydroxy-1-oxo-3,4-diphenyl-2-oxaspiro[4.4]non-3-yl)cyclopentanecarboxylate are obtained.