酮的施密特重排的范围已扩展到酰基膦酸二烷基酯 (11a-111)。令人惊讶的是,发现 11a-11d 和 11g,其中酰基部分是单独的苯甲酰基或带有吸电子或轻度放电子取代基的苯甲酰基,产生了绝大多数由芳基的 C 到 N 迁移产生的产物组(N-芳基氨基甲酰基膦酸酯,12 和 N-芳基甲酰胺,15)。相反,带有强大的电子释放对烷氧基的芳烃羰基膦酸酯产生由膦酸酯基团从 C 迁移到 N 或消除的产物(N-芳烃羰基磷酰胺二烷基酯,13 和芳烃甲腈,分别为 17)
1,3-Dipolar cycloaddition reactions of acyl phosphonates with nitrile oxides: synthesis of phosphonate-containing dioxazole derivatives
作者:Sidika Polat-Cakir
DOI:10.1080/10426507.2020.1854259
日期:2021.5.4
1,3-dipolar cycloadditionreactions of nitrileoxides used as dipole with acyl phosphonates under basic conditions. Herein, acyl phosphonates take part in the cyclization process as a dipolarophile to afford the related dioxazole compounds in moderate-to-good yields (49–84%). Substituted arylnitrileoxides and aroyl phosphonates were employed in the 1,3-dipolar cycloadditionreactions where triethylamine
摘要 新的含膦酸酯的五元杂环二恶唑衍生物是通过在碱性条件下用作偶极的腈氧化物与酰基膦酸酯的1,3-偶极环加成反应合成的。在此,酰基膦酸酯以双极性亲和性参与环化过程,以中等至良好的收率(49-84%)提供相关的二恶唑化合物。取代的芳基腈氧化物和芳酰基膦酸酯用于1,3-偶极环加成反应中,其中三乙胺是有效的叔碱。酰基膦酸酯的烷基形式也提供了预期的环加合物,即5-异丙基-3-苯基-3-苯基-1,4,2-二恶唑-5-基-5-膦酸二甲酯。二/二甲基3,5-芳基-1,4,2-二恶唑-5-基-5-膦酸酯衍生物充分特征在于,使用1 H NMR,13C NMR,31 P-NMR和FT以及高分辨率质谱。
Reactions of acyl phosphonates with organoaluminum reagents: a new method for the synthesis of secondary and tertiary α-hydroxy phosphonates
作者:Ozlem Seven、Sidika Polat-Cakir、Md. Shakhawoat Hossain、Mustafa Emrullahoglu、Ayhan S. Demir
DOI:10.1016/j.tet.2011.03.036
日期:2011.5
) with aryl and alkyl acyl phosphonates, which lead to the formation of α-hydroxyphosphonates in moderate to good yields, are reported. This method provides easy access to secondary and tertiary α-hydroxyphosphonates depending on the reaction conditions. The reactions of triethylaluminum with a series of acyl phosphonates at 0 °C gave the secondary α-hydroxyphosphonates, while at −100 °C they afford
Geminal difunctionalization of α-diazo arylmethylphosphonates: synthesis of fluorinated phosphonates
作者:Yujing Zhou、Yan Zhang、Jianbo Wang
DOI:10.1039/c6ob01858k
日期:——
A general approach towards diverse fluorinated phosphonates via geminal difunctionalization reactions of α-diazo arylmethylphosphonates is described. The diazo functionality (RR′CN2) is successfully converted to RR′CF2, RR′CHF, RR′CFBr or RR′CFNR′′2 groups by employing different fluorination reagents. A variety of fluorinated organophosphorus compounds were readily accessed in good to excellent yields
Darzens Reaction of Acyl Phosphonates with α-Bromo Ketones: Selective Synthesis of <i>cis</i>- and <i>trans</i>-Epoxyphosphonates
作者:Ayhan S. Demir、Mustafa Emrullahoglu、Eser Pirkin、Nazmiye Akca
DOI:10.1021/jo801818p
日期:2008.11.21
Acyl phosphonates with alpha-halo ketones in the presence of bases at room temperature afford cis- and trans-epoxyphosphonates in good chemical yields and high selectivities using different bases. The diastereoselectivity of this reaction is easily controlled by changing the base. Changing the base from Cs2CO3 to DBU changed the diastereomeric ratio (trans/cis) from 3/2 to 9/1. Moreover, the treatment
Self-condensation reactions of acyl phosphonates: synthesis of tertiary $O$-protected $\alpha $-hydroxyphosphonates
作者:Serkan EYMUR、Mehmet GÖLLÜ、Ayhan Sıtkı DEMİR
DOI:10.3906/kim-1306-7
日期:——
The self-condensation reaction of benzoyl dialkyl phosphonates was developed using cyanide ion as catalyst, affording versatile tertiary O-protected \alpha-hydroxy phosphonates in moderate yield.
以氰离子为催化剂,开发了苯甲酰基二烷基膦酸盐的自缩合反应,以中等收率获得了多功能三级 O 保护的 \α- 羟基膦酸盐。