Highly functionalised (γ-azido/γ-fluoro-β-iodo/)vinyl derivatives from phosphorus based allenes or allenoates: I⋯O halogen bonding interactions
作者:Mandala Anitha、K. C. Kumara Swamy
DOI:10.1039/c9ob00715f
日期:——
azidation/fluorination of phosphorus-based allenes or allenoates (allenyl esters) or a sulphur based allene. Surprisingly, the reaction of (γ,β)-diiodo-vinyl-phosphonate with TBAF [n-Bu4NF] led to the corresponding allenylphosphonate; in contrast, the use of CsF in a similar reaction led to novel γ-diiodo-allenylphosphonate along with the corresponding non-halogenated allenylphosphonate. The combination
通过碘化,随后磷基丙二烯或烯丙酸酯(烯丙酸酯)或硫基丙二烯的叠氮化/氟化来合成多功能γ-叠氮基/γ-氟-β-碘-乙烯基膦氧化物/膦酸酯/酯/砜。令人惊奇的是,(γ,β)-二碘-乙烯基膦酸酯与TBAF [ n- Bu 4 NF]的反应产生了相应的烯丙基膦酸酯。相反,在类似反应中使用CsF会导致产生新的γ-二碘代烯丙基膦酸酯以及相应的非卤代烯基膦酸酯。AgF 2的组合/ CuBr可用于获得γ-氟-β-碘-乙烯基膦氧化物和相关的无磷γ-氟-β-碘-乙烯基酯。在许多情况下,还观察到I⋯O卤素与氧的非共价键相互作用(“卤素键”),涉及磷酰基(PO)氧,如单晶X射线晶体学所证明的那样。
Acid-promoted transformations of 1-(diphenylphosphoryl)allenes: synthesis of novel 1,4-dihydrophosphinoline 1-oxides
作者:Alexander S. Bogachenkov、Albina V. Dogadina、Vadim P. Boyarskiy、Aleksander V. Vasilyev
DOI:10.1039/c4ob02269f
日期:——
stable compounds. The latter compounds are formed from phosphonoallenes under the action of a strong Lewis acid AlCl3 at room temperature for 10–120 min. This is a novel, simple and efficient (short reaction time, high yields) method for synthesis of such 1,4-dihydrophosphinoline 1-oxides.
在-70至120°C下于Brønsted(超级)酸(TfOH,FSO 3 H和H 2 SO 4)中的1-(二苯基磷酰基)烷基1,2-二烯(膦烯基烯)在-70至120°C下放置30分钟至4小时首先,作为动力学上有利的反应产物的(3-羟基烷-1-烯-1-基)二苯基膦氧化物被进一步转化为热力学上稳定的化合物1-苯基-1,4-二氢膦基啉1-氧化物。后者的化合物是由磷酸壬烯在强路易斯酸AlCl 3的作用下于室温下作用10–120分钟而形成的。这是一种新颖,简单,有效的方法(反应时间短,产率高),用于合成此类1,4-二氢膦基环氧化物1-氧化物。
Synthesis of 1,4-dihydrophosphinoline 1-oxides by acid-promoted cyclization of 1-(diphenylphosphoryl)allenes
作者:Alexander S. Bogachenkov、Albina V. Dogadina、Irina A. Boyarskaya、Vadim P. Boyarskiy、Aleksander V. Vasilyev
DOI:10.1039/c5ob02143j
日期:——
Phosphonoallenes in Brønsted acids (TfOH, FSO3H, H2SO4) gave the corresponding 1,2-oxaphosphol-3-enium ions, that were studied by means of NMR and DFT calculations.
Dihalocarbene addition to allenic phosphine oxides occurs mainly at the allylic double bond. Treatment of dibromocarbene adducts with BuLi leads to cumulated trienephosphine oxides. In some cases, the intermediate alkylidenecyclopropylidene (or its precursor) is exceptionally stabilized, and this carbene (or carbenoid) is trapped by the corresponding cumulated trienephosphine oxide in a bimolecular process. The resultant spiropentane is formed in a regio- and stereoselective manner.
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