通过Petasis borono-Mannich反应的一种变体,可以从芳基硼酸,含水乙二醛和1,2-氨基乙醇轻松制备2-羟基-3-芳基吗啉。我们现在表明,可以通过用甲磺酸酐和三乙胺处理将2-羟基-3-芳基吗啉脱氧为3-芳基吗啉,以提供中间体3,4-二氢-2 H -1,4-恶嗪,然后与用三乙酰氧基硼氢化盐和乙酸制得3-芳基吗啉。该反应序列由容易获得的起始材料(1,2-氨基乙醇,芳基硼酸和乙二醛)组成的三步“两锅”制备3-芳基吗啉,具有优异的官能团耐受性和规模适应性。
通过Petasis borono-Mannich反应的一种变体,可以从芳基硼酸,含水乙二醛和1,2-氨基乙醇轻松制备2-羟基-3-芳基吗啉。我们现在表明,可以通过用甲磺酸酐和三乙胺处理将2-羟基-3-芳基吗啉脱氧为3-芳基吗啉,以提供中间体3,4-二氢-2 H -1,4-恶嗪,然后与用三乙酰氧基硼氢化盐和乙酸制得3-芳基吗啉。该反应序列由容易获得的起始材料(1,2-氨基乙醇,芳基硼酸和乙二醛)组成的三步“两锅”制备3-芳基吗啉,具有优异的官能团耐受性和规模适应性。
The three-component coupling of an 1,2-aminoalcohol, a 1,2-dicarbonyl compound and a boronic acid was investigated. The reaction is supposed to proceed through the formation of a heterocyclic iminium species followed by the addition of the organoboron derivative. The diastereoselectivity of this process is discussed. Best results were observed when the probable intermediate was generated from a preformed 3-phenylthiomorpholin-2-ol. Products of this three-component boro-Mannich could be readily converted to the corresponding aminodiols by reduction with lithium aluminium hydride. (c) 2006 Elsevier Ltd. All rights reserved.