serves as an effective promoter for the room-temperature stereoselective synthesis of α,β-unsaturated esters, fluorides, and nitriles from a wide array of aromatic, aliphatic, heterocyclic, and cyclic aldehydes and ketones, using a range of Wadsworth−Emmons (WE) phosphonates. Among the analogues of 1c [R = Me (1a), i-Pr (1b), Bn (1d)], 1a and 1b performed well, although longer reaction times were involved
双环三
氨基膦P(RNCH 2 CH 2)3 N(R = i -Bu,1c)可作为室温下立体选择性合成α,β-不饱和酯,
氟化物和腈的有效
促进剂芳香族,脂肪族,杂环和环状醛和酮,使用一系列Wadsworth-Emmons(WE)
膦酸酯。在1c [R = Me(1a),i -Pr(1b),Bn(1d)]的类似物中,1a和1b表现良好,尽管涉及的反应时间更长,而1d导致的收率低于1c。
氰基,
氯,
溴,甲氧基,
氨基,酯和硝基等官能团的耐受性很好。我们能够分离和表征(通过X射线;见上文)由2b和1c形成的反应性WE中间体。