synthesized in moderate yield from readily available omega-amino-H-phosphinates and aldehydes or ketones via an intramolecular Kabachnik-Fields reaction. The products are conformationally restricted phosphinic analogs of alpha-amino acids. The multigram-scale syntheses of the H2N(CH2)(n)PO2H2 phosphinic precursors (n = 1, 2, 3) and some derivatives are also described.
P,N-杂环(3-羟基-1,3-
氮杂
磷杂环戊烷和3-羟基-1,3-
氮杂
磷杂
环丁烷-3-
氧化物)是通过容易获得的ω-
氨基-H-
次膦酸酯和醛或
酮经中等产率合成的分子内Kabachnik-Fields反应。产物是
α-氨基酸的构象受限的
次膦酸酯类似物。还描述了
H2N(
CH2)(n)PO2H2
次膦酸酯前体(n = 1、2、3)和某些衍
生物的数克级合成。