bromure d'(propylene-1',3' dithio)-2,2 ethyl-1 triphenylphosphonium 、 ((12R,13S)-13-Formyl-1,4,8,11-tetraoxa-dispiro[4.1.4.2]tridec-12-yl)-acetic acid methyl ester 在
potassium tert-butylate 作用下,
生成 [(12R,13R)-13-((Z)-2-[1,3]Dithian-2-yl-vinyl)-1,4,8,11-tetraoxa-dispiro[4.1.4.2]tridec-12-yl]-acetic acid methyl ester