Unsaturated fluoro analogues of adenine nucleotides. Unusual eliminations of hydrogen halides in α,α-difluorophosphonates containing a heterocyclic base
摘要:
Reaction of bromodifluoromethyl phosphonate 3 with zinc and propynyl chloride led to allenyl phosphonate which was brominated to give dibromophosphonate 6. Alkylation of adenine 7 with 6 afforded Z- and E-difluorophosphonates 8 and 9. Hydrogenation of 8 furnished saturated difluorophosphonate 10a which was dealkylated to the corresponding phosphonic acid 10b. Reaction of 8 with tetrabutylammonium fluoride gave fluoroenyne phosphonate 11 whereas 9 and 1,5-diazabicyclo[4.3.0] non-5-ene furnished bromofluorodiene phosphonate 16. Hydrogenation of 11 afforded phosphonates 13 and 14 in addition to defluorinated product 15. (C) 1997 Elsevier Science Ltd.
Fluorine in enzyme Chemistry: Part 1. Synthesis of difluoromethylenephosphonate derivatives as phosphate mimics
作者:R.D. Chambers、R. Jaouhari、D. O'Hagan
DOI:10.1016/s0022-1139(00)83944-5
日期:1989.8
Diethyl difluoromethylphosphonylcadmium bromide reacts with allyl and benzyl halides in THF to give the corresponding difluoromethylenephosphonate derivatives. The reaction with allyl bromide affords a versatile synthetic intermediate which undergoes a variety of synthetic transformations and therefore becomes a key compound in the preparation of elaborated difluoromethylenephosphonates of biological
CuX 2 -mediated halocyclization of 1,1-difluoro-2,3-allenylphosphonic acid monoesters –synthesis of novel cyclic phosphate mimics
作者:Xu Jiang、Xiang Cai、Yun Lin、Jintao Liu
DOI:10.1016/j.tet.2018.06.058
日期:2018.8
2-oxaphosphinine 2-oxides) were synthesized via CuX2 (X = Br, Cl)-mediated halocyclization of 1,1-difluoro-2,3-allenylphosphonic acidmonoesters in moderate to good yields with high regio-selectivity. This reaction represents the first example of transition metal-mediated intramolecular cyclization of a P-OH moiety to β-allenylphosphonates with a carbon-carbon double bond.
通过CuX 2(X = Br,Cl)介导合成了新颖的六元环状磷酸酯模拟物(5-卤代-3,3-二氟-3,6-二氢-2 H -1,2-氧杂膦酸2-氧化物)1,1-二氟-2,3-烯丙基膦酸单酯的卤代化,具有中等至良好的收率,具有较高的区域选择性。该反应代表了过渡金属介导的P-OH部分分子间环化为具有碳-碳双键的β-烯丙基膦酸酯的第一个例子。
Allylations of [(diethoxyphosphinyl)difluoromethyl]zinc bromide as a convenient route to 1,1-difluoro-3-alkenephosphonates
作者:Donald J. Burton、Lee G. Sprague
DOI:10.1021/jo00264a021
日期:1989.2
A facile method to construct cyclic α,α-difluoromethylenephosphonate—A novel cyclic phosphate mimic
作者:Yun Lin、Jin-Tao Liu
DOI:10.1016/j.jfluchem.2011.02.014
日期:2011.5
A facile and efficient synthesis of cyclic alpha,alpha-difluoromethylenephosphonates by halogen-induced intramolecular cyclization of beta-allenic alpha,alpha-difluoromethylenephosphonates is described. The protocol gives multi-substituted six-membered phosphonates with high regioselectivity, providing a new entry to the cyclic phosphate mimics which is still an unexplored but promising area. (C) 2011 Elsevier B.V. All rights reserved.