Raza; Khullar; Agarwal, Seema, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 2, p. 154 - 156
作者:Raza、Khullar、Agarwal, Seema、Jaiswal
DOI:——
日期:——
Spontaneous Lossen Rearrangement of (Phosphonoformyl)hydroxamates. The Migratory Aptitude of the Phosphonyl Group
作者:Claudio J. Salomon、Eli Breuer
DOI:10.1021/jo962075k
日期:1997.6.13
(i-PrO)(2)P(=O)COSEt (1) reacted with NH2OH in pyridine at room temperature to give mainly (i-PrO)(2)P(=O)NH2 (4). The formation of 4 was interpreted in terms of a spontaneous Lessen rearrangement of (i-PrO)(2)P(=O)CONHOH (2a) formed in the reaction. A transient (PNMR)-P-31 signal appearing in the reaction mixture at delta -1.8 was assigned to 2a. Trapping of (i-PrO)(2)P(=O)N=C=O (5), formed in the reaction of 1 and NH2OH, by cyclohexylamine gave (i-PrO)(2)P(=O)NHCONHC6H11 (6). Attempted isolation of 6 gave the hydrolyzed product N-cyclohexylurea (7). The reaction of 1 with NH2OMe proceeded slower than that with NH2OH and gave the expected (i-PrO)(2)P(=O)CONHOMe (2b), which was isolated and identified. 2b converts slowly to 4 in pyridine at room temperature. In contrast, MeNHOH reacted rapidly with 1 and gave the stable crystalline (i-PrO)(2)P(=O)CON(Me)OH (2c). The structure of hydroxamates 2 were assigned on the basis of H-1, C-13, and P-31 NMR spectral data. This facile Lossen rearrangement is discussed in terms of the unusually high migratory aptitude of the phosphonyl group.
申请人:Yissum Research Development Company of the Hebrew University of Jerusalem
公开号:US07101864B1
公开(公告)日:2006-09-05
The present invention relates to compositions useful for treating or controlling disease states or conditions associated with zinc containing proteinases, especially metalloproteinases. The active ingredient in these compositions is an alpha-oxo- or alpha-thixophosphpnate of formula (I). Out of the phosphonates of formula (I), some are known and others are new. The novel compounds constitute another aspect of the invention.
Neutral rare-earth-metal monoalkyl complexes and anionic rare-earth-metal dialkyl complexes with a silicon-linked diarylamido ligand were synthesized and characterized, and their catalytic activities toward the additions of dialkyl phosphites to isocyanates were developed. Reactions of rare-earth-metal trialkyl complexes RE(CH2SiMe3)3(THF)2 with a silicon-linked diarylamine ligand in n-hexane afforded
合成和表征了具有硅连接的二芳基酰胺配体的中性稀土金属单烷基络合物和阴离子稀土金属二烷基络合物,并开发了它们对亚磷酸二烷基酯加至异氰酸酯的催化活性。稀土类金属的反应的三烷基络合物RE(CH 2森达3)3(THF)2在硅联二芳基胺配体Ñ己烷,得到中性稀土类金属单烷基络合物大号RE(CH 2森达3) (THF)2(RE = Y(1),Er(2); L =(Me 2Si)(2,6- i Pr 2 C 6 H 3 N)2)的产率很高。通过H 2 L,n BuLi,的盐复分解反应合成了双核稀土金属氯化物[ L RE(μ- Cl)(THF)2 ] 2(RE = Y(3),Er(4))。和无水RECl 3。用4当量的LiCH 2 SiMe 3在甲苯中处理稀土金属氯化物,生成相应的离散的异双金属稀土金属二烷基络合物L RE(CH2 SiMe 3)2(THF)Li(THF)4(RE = Y(5),Er(6))。进一步的研究表明,在存在0