A combination of 4‐picoline and Ph3P (or nBu3P) efficiently promotes a formal [2+2+1] synthesis of tetrasubstituted furans from aldehydes, acetylenedicarboxylates and acyl compounds through O‐acylation of the α,β‐enone intermediates followed by intramolecular Wittig reaction under the metal‐free and mild conditions. The present method can be applied not only to acyl chlorides but also trifluoroacetic
4-
甲基吡啶和Ph 3 P(或n Bu 3 P)的组合有效地促进了α,β-烯酮的O-酰化作用由醛,炔二
羧酸酯和酰基化合物从四价
呋喃[2 + 2 + 1]形式正式合成中间体,然后在无
金属和温和条件下进行分子内Wittig反应。本方法不仅可以应用于酰
氯,而且可以作为酰基化合物应用于
三氟乙酸酐。