Rearrangements of Nonracemic Vinyl Phosphates to .beta.-Keto Phosphonates
摘要:
A series of chiral auxiliaries has been tested for viability in the vinyl phosphate/beta-keto phosphonate rearrangement. While dienyl phosphates derived from ephedrine, pseudoephedrine, and isopinocampheol succumbed to competing elimination reactions, ones derived from menthol and (S)-2-methylbutanol were found to undergo rearrangement to the desired beta-keto phosphonates. The bis((S)2-methylbultyl) phosphorochloridate then was used to prepare the vinyl phosphates of the prochiral ketone 4-methylcyclohexanone, and modest diastereoselectivity was observed upon rearrangement of these phosphates to the corresponding beta-keto phosphonates. The de of this rearrangement was established by degradation of the beta-keto phosphonate to 3-methyladipic acid and determination of the optical rotation. This sequence allowed identification of the major rearrangement product as the 4R-diastereomer of beta-keto phosphonate 13. Finally, two other prochiral cyclohexanones were found to be suitable substrates for the vinyl phosphate/beta-keto phosphonate rearrangement.
排他性地,阴离子磷酸-弗里斯重排已成功地用于手性二茂铁基磷酸酯,产生了非对映异构体富集的1,2- P,O-膦酸酯(至多95%de),其可以进一步转化为对映体纯的膦。报道了一种基于所有手性池醇,手性(二)氯磷酸酯和相应的二茂铁磷酸酯的制备所有原料的简单合成方案。阴离子磷酸-弗里斯重排的最佳反应条件允许在环境温度下进行转化,并在己烷中使用可变的锂酰胺基碱和二胺,确保实际上定量的收率,并避免了副反应。(双)环烷基取代基可形成对空气和水分稳定的化合物,并且还可以将1,1'-取代的衍生物转化为1,1',2,2'-官能化的二茂铁,这是首次报道。磷酸二铁茂铁基同时重排至次膦酸酯,甚至2-羟基-1,可以进行3-双(膦酰基)二茂铁及其在环境条件下的后处理。单晶衍射分析可以确定两种非对映体纯二茂铁的平面手性的绝对构型。R p异构体。此外,观察到三种化合物在芳族C 5 H 3和C 5 H 4循环之间的强T形π-π相互作用模式。
Planar Chirality from the Chiral Pool: Diastereoselective Anionic Phospho-Fries Rearrangements at Ferrocene
作者:Marcus Korb、Heinrich Lang
DOI:10.1021/om500953c
日期:2014.11.24
phosphates is reported. Optimized reaction conditions for the anionic phospho-Fries rearrangement allow conversions at ambient temperature and the use of variable lithium amid bases and diamines in hexane, ensure virtually quantitative yields, and avoid side reactions. The (bi)cyclic alkyl substituents result in air- and moisture-stable compounds and furthermore allow the conversion of 1,1′-substituted derivatives
排他性地,阴离子磷酸-弗里斯重排已成功地用于手性二茂铁基磷酸酯,产生了非对映异构体富集的1,2- P,O-膦酸酯(至多95%de),其可以进一步转化为对映体纯的膦。报道了一种基于所有手性池醇,手性(二)氯磷酸酯和相应的二茂铁磷酸酯的制备所有原料的简单合成方案。阴离子磷酸-弗里斯重排的最佳反应条件允许在环境温度下进行转化,并在己烷中使用可变的锂酰胺基碱和二胺,确保实际上定量的收率,并避免了副反应。(双)环烷基取代基可形成对空气和水分稳定的化合物,并且还可以将1,1'-取代的衍生物转化为1,1',2,2'-官能化的二茂铁,这是首次报道。磷酸二铁茂铁基同时重排至次膦酸酯,甚至2-羟基-1,可以进行3-双(膦酰基)二茂铁及其在环境条件下的后处理。单晶衍射分析可以确定两种非对映体纯二茂铁的平面手性的绝对构型。R p异构体。此外,观察到三种化合物在芳族C 5 H 3和C 5 H 4循环之间的强T形π-π相互作用模式。
Sigmatropic [2,3]-Wittig Rearrangement of α-Allylic-Heterosubstituted Methylphosphonates. Part 31: High Diastereoselectivity in the Rearrangement of Anion of Dimenthyl Allyloxymethylphosphonate
作者:M Gulea-Purcarescu
DOI:10.1016/00404-0399(50)1353j-
日期:1995.9.11
Rearrangements of Nonracemic Vinyl Phosphates to .beta.-Keto Phosphonates
作者:Yi-Zhong An、Jian Guo An、David F. Wiemer
DOI:10.1021/jo00105a042
日期:1994.12
A series of chiral auxiliaries has been tested for viability in the vinyl phosphate/beta-keto phosphonate rearrangement. While dienyl phosphates derived from ephedrine, pseudoephedrine, and isopinocampheol succumbed to competing elimination reactions, ones derived from menthol and (S)-2-methylbutanol were found to undergo rearrangement to the desired beta-keto phosphonates. The bis((S)2-methylbultyl) phosphorochloridate then was used to prepare the vinyl phosphates of the prochiral ketone 4-methylcyclohexanone, and modest diastereoselectivity was observed upon rearrangement of these phosphates to the corresponding beta-keto phosphonates. The de of this rearrangement was established by degradation of the beta-keto phosphonate to 3-methyladipic acid and determination of the optical rotation. This sequence allowed identification of the major rearrangement product as the 4R-diastereomer of beta-keto phosphonate 13. Finally, two other prochiral cyclohexanones were found to be suitable substrates for the vinyl phosphate/beta-keto phosphonate rearrangement.
Solvent-assisted monomeric molecular structure of the phosphate diester and the synthesis of menthol-based phosphate diesters
作者:Debdeep Mandal、Vivek Gupta、Biswajit Santra、Nicolas Chrysochos、Vivek W Bhoyare、Avijit Maiti、Abhisek Kar、Suman、Anku Guha、Pallavi Thakur、Ramakirushnan Suriya Narayanan、Nitin T Patil、Carola Schulzke、Vadapalli Chandrasekhar、Anukul Jana
DOI:10.1007/s12039-019-1712-8
日期:2019.12
l substituted phosphatediester. In these instances, solvent-incorporated dimeric structures are found in the solid-state. We also report the syntheses and molecular structures of anionic phosphatediesters of 2,6-(CHPh)2-4-iPr-phenyl substituted phosphatediester possessing various counter cations. Moreover, we also report the syntheses and molecular structures of phosphatediesters based on (−)-menthol
摘要众所周知,磷酸二酯以其固态形成分子间氢键键合的二聚体结构。最近,我们报道了2,6-(CHPh)2 -4- i Pr-苯基取代的磷酸二酯作为氢键结合的单体分子结构与水二聚体一起以固态形式存在。在本文中,我们报告了2,6-(CHPh)2 -4- i Pr-苯基取代的磷酸二酯在与二甲基甲酰胺DMF(Me 2 NCHO)共结晶时形成固态的单体分子结构。DMF的-CHO基团同时充当P-OH的H键受体和P = O部分的H键供体。我们还使用了ROH(R = Me,Et,i Pr和tBu),用于2,6-(CHPh)2 -4- i Pr-苯基取代的磷酸二酯的结晶。在这些情况下,发现以固态结合了溶剂的二聚体结构。我们还报告了具有各种抗衡阳离子的2,6-(CHPh)2 -4- i Pr-苯基取代的磷酸二酯的阴离子磷酸二酯的合成和分子结构。此外,我们还报告了基于(-)-薄荷醇,(+)-薄荷醇和(+)/(-