Lewis acid catalyzed aldol-type reaction of 1,1-difluorovinyl methyl ether derivatives
作者:Yoshitoshi Kodama、Hidefumi Yamane、Masato Okumura、Motoo Shiro、Takeo Taguchi
DOI:10.1016/0040-4020(95)00785-7
日期:1995.11
In the presence of Lewis acid, such as SbCl5, SbCl6·NAr3 or Cu(OTf)2, difluorovinyl methyl ether (1,1-difluoro-2-methoxy-1-alkene) 1 reacted with carbonyl compounds to give O-methylated aldol-type products 3 in good yields, while Lewis acid, such as TMSOTf, TiCl4 or BF3·Et2O, did not work in these reactions. On the other hand, TMSOTf was found an effective catalyst for the reaction of 1 with carbonyl
在路易斯酸(如SbCl 5,SbCl 6 ·NAr 3或Cu(OTf)2)存在下,二氟乙烯基甲基醚(1,1-二氟-2-甲氧基-1-烯烃)1与羰基化合物反应生成O -甲基化的醛醇型产物3的收率很高,而路易斯酸(如TMSOTf,TiCl 4或BF 3 ·Et 2 O)在这些反应中不起作用。另一方面,发现TMSOTf是在烷基TMS醚8的存在下1与羰基化合物反应的有效催化剂,以高收率得到O-烷基化的醛缩型产物9。