Novel α-formylation of α,α-disubstituted esters. Trimethylsilyl trifluoromethanesulphonate-catalysed reaction of ketene silyl acetals with N-t-butylformimidoyl cyanide
作者:Kohji Okano、Toshiaki Morimoto、Minoru Sekiya
DOI:10.1039/c39850000119
日期:——
General α-formylation of α,α-disubstituted methyl acetates can be achieved by the reaction of ketene silyl acetals (1) with N-t-butylformimidoyl cyanide (2) in the presence of trimethylsilyl trifluoromethanesulphonate (3) as catalyst followed by hydrolysis of the products (4) and/or (5) with copper(II) acetate or hydrogen chloride in aqueous methanol.
在三甲基甲
硅烷基
三氟甲磺酸酯(3)存在下,
乙烯酮甲
硅烷基
缩醛(1)与N-叔丁基甲
酰亚胺基
氰化物(2)反应,可实现α,α-二取代
乙酸甲酯的一般α-甲酰化反应。产物(4)和/或(5)与
乙酸铜(II)或
氯化氢在
甲醇水溶液中的混合物。