Synthesis of β-(trifluoromethyl)furans and spiro-gem-dichlorocyclopropanes from cyclic 1,3-dicarbonyl compounds and α-(trihaloethylidene)nitroethanes
摘要:
While 1,3-dicarbonyl compounds react with (E)-1,1,1-trifluoro-3-nitrobut-2-ene in the presence of sodium acetate to produce the target beta-(trifluoromethyl)furans, their reaction with (E)-1,1,1-trichloro-3-nitrobut-2-ene, under the same conditions, took an entirely different course and gave spiro-gem-dichlorocyclopropanes bearing a 1-nitroethyl moiety, with high diastereoselectivity and in good yields. (C) 2013 Elsevier Ltd. All rights reserved.