Various alkoxy(N-tert-butylamino)(methyl)sulfonium triflates are prepared by selective O-alkylation of N-tert-butylmethanesulfinamide (4c) with primary alkyl trifluoromethanesulfonates (triflates). Successive treatment of thus formed alkoxyaminosulfonium salts with DBU smoothly affords the corresponding aldehydes in good yields. The sequential combination of the two reactions provides a new method for oxidation of primary alkyl triflates to aldehydes, and the present study suggests the existence of alkoxysulfilimines as intermediates of the previously-reported direct oxidation of alcohols by using N-tert-butylphenylsulfinimidoyl chloride (1a) and DBU.
通过 N-叔丁基甲磺酰胺(4c)与伯烷基
三氟甲磺酸盐(三
氟酸盐)的选择性 O-烷基化反应,制备出各种烷氧基(N-叔丁基
氨基)(甲基)三
氟锍盐。用
DBU 连续处理由此生成的烷氧基
氨基磺鎓盐,可以顺利地得到相应的醛,而且收率很高。这两个反应的顺序结合提供了一种将伯烷基三
氟甲基磺酸盐氧化成醛的新方法,而且本研究表明,在之前报道的使用 N-
叔丁基苯基亚磺
酰亚胺酰
氯 (1a) 和
DBU 直接氧化醇的过程中,存在作为中间产物的烷氧基亚磺
酰亚胺。