P[N(<i>i-</i>Bu)CH<sub>2</sub>CH<sub>2</sub>]<sub>3</sub>N: Nonionic Lewis Base for Promoting the Room-Temperature Synthesis of α,β-Unsaturated Esters, Fluorides, Ketones, and Nitriles Using Wadsworth−Emmons Phosphonates
作者:Venkat Reddy Chintareddy、Arkady Ellern、John G. Verkade
DOI:10.1021/jo1012515
日期:2010.11.5
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。