Rh-Catalyzed Addition of Arylboroxines to Cyclic N-(Isopropanesulfinyl)ketimines
摘要:
Arylboroxines, which are easily accessed by drying commercially available arylboronic acids, are added to N-(isopropanesulfinyl)ketimines derived from cyclohexanone, N-Boc-piperidin-4-one, and tetrahydropyran-4-one in high yields and with excellent functional group compatibility via rhodium catalysis. These results contrast with additions to the corresponding ketimines incorporating the larger N-tert-butanesulfinyl group, which give considerably lower yields. Efficient two-step preparation of racemic isopropanesulfinamide from inexpensive isopropyl disulfide and recycling of the isopropanesulfinyl group from the addition products are also described.
Further studies in the chemistry of 2,3-dihydro-1,2,3-triphenyl-1H-1,2,3-benzotriphosphole and related compounds. Part II
作者:Frederick G. Mann、Anthony J. H. Mercer
DOI:10.1039/p19720002548
日期:——
o-Phenylenebis(phenylphosphine)(II), now readily available, is a valuable precursor in the synthesis of several new heterocyclic systems having a benzene ring fused to a five- or six-membered ring containing at least two phosphorus atoms. The following heterocyclic systems (with phenyl substituents) have been prepared: the 1,2,3-benzotriphospholes (V; R = Me or Et); the 1,3,2-benzodiphospharsoles (VIII;
现已很容易获得的邻苯二甲双(苯基膦)(II)是几种新的杂环体系的合成中有价值的前体,这些杂环体系的苯环与含至少两个磷原子的五元或六元环稠合。已经制备了下列杂环系统(具有苯基取代基):1,2,3-苯并三磷(V; R = Me或Et);1,3,2-苯并二磷基(VIII; R = Ph或Me); 1,3-苯并二磷(X); 1,4-苯并二膦酸酯(XI)和(XXVII); 和二苯并[ c,g ] [1,2,5,6]-四磷霉素(XXIII)。已经研究了这些化合物的化学和光谱性质。
ß-boration of alkene and alkyne intermediates
申请人:LEK Pharmaceuticals d.d.
公开号:EP2647639A1
公开(公告)日:2013-10-09
The present invention relates to the field of organic chemistry, and in particular to the preparation of β-borated compounds. These β-borated compounds can be used as intermediates in the synthesis of pharmaceutically active agents such as Sitagliptin.
The invention relates to the preparation of chiral compounds, in particular to the preparation of chiral compounds which may be used as intermediates for the preparation of anti-diabetic agents, preferably sitagliptin.
Relative and absolute configurations of diastereomeric macrocyclic diphosphine ligands and their Ni(II) complexes
作者:Michael Widhalm、Gerd Klintschar
DOI:10.1016/s0957-4166(00)86169-8
日期:1994.1
The 20 membered chiral diphospine ligands 5A–C were prepared under high dilution conditions as a mixture of diastereomers. The absolute and relative configurations could be established on the basis of NMR and CD spectroscopy of the ligands and their Ni(II) complexes. The assignment was confirmed by a crystal structure analysis of the Ni complex of 5B.
Further studies in the chemistry of 2,3-dihydro-1,2,3-triphenyl-1H-1,2,3-benzotriphosphole and related compounds. Part I
作者:Frederick G. Mann、Anthony J. H. Mercer
DOI:10.1039/p19720001631
日期:——
The study of the probable mechanisms whereby certain o-dihalogenobenzenes react with the crude product of the interaction of lithium and phenylphosphonous dichloride to form 2,3-dihydro-1,2,3-triphenyl-1H-1,2,3-benzo-triphosphole (I) and 5,10-dihydro-5,10-diphenylphosphanthren (II) has been extended. Lithium reacts with certain polyphenylcyclopolyphosphines in solution, giving a product (XIV) which
某些邻二卤代卤苯与锂与苯基二氯化磷相互作用的粗产物反应生成2,3-二氢-1,2,3-三苯基-1 H -1,2,3-苯并的可能机理的研究-三磷腈(I)和5,10-二氢-5,10-二苯基磷蒽(II)已被扩展。锂与溶液中的某些聚苯基环多膦反应,生成产物(XIV),该产物类似地与邻二卤代苯反应形成苯并三磷(I)。后者也可以通过二氯化苯基磷与邻亚苯基双[硫代(苯基)膦]的相互作用获得。