1200959-54-1Relevant articles and documents
Rhodium-Catalyzed PIII-Directed ortho-C?H Borylation of Arylphosphines
Wen, Jian,Wang, Dingyi,Qian, Jiasheng,Wang, Di,Zhu, Chendan,Zhao, Yue,Shi, Zhuangzhi
, p. 2078 - 2082 (2019)
Transition-metal-mediated metalation of an aromatic C?H bond that is adjacent to a tertiary phosphine group in arylphosphines via a four-membered chelate ring was first discovered in 1968. Herein, we overcome a long-standing problem with the ortho-C?H activation of arylphosphines in a catalytic fashion. In particular, we developed a rhodium-catalyzed ortho-selective C?H borylation of various commercially available arylphosphines with B2pin2 through PIII-chelation-assisted C?H activation. This discovery is suggestive of a generic platform that could enable the late-stage modification of readily accessible arylphosphines.
Ruthenium-Catalyzed ortho C?H Borylation of Arylphosphines
Fukuda, Kazuishi,Iwasawa, Nobuharu,Takaya, Jun
, p. 2850 - 2853 (2019/02/16)
Efficient, phosphine-directed ortho C?H borylation of arylphosphine derivatives was achieved using Ru catalysts for the first time. The reaction is applicable to various tertiary arylphosphine and arylphosphinite derivatives to give (o-borylaryl)phosphoru
Synthesis of C2-symmetric bisphosphine ligands from tartaric acid, and their performance in the Pd-Catalyzed asymmetric o-allylation of a phenol
Dindaroglu, Mehmet,Akyol Dincer, Sema,Schmalz, Hans-Guenther
supporting information, p. 4315 - 4326 (2014/07/21)
Starting from tartaric acid derived chiral diols or dicarboxylic acid dichlorides with either a 2,2-dimethyl-1,3-dioxolane (Taddol) or a 2,3-dimethoxy-2,3-dimethyl-1,4-dioxane (Tatrol) core structure, and BH 3-protected ortho-phosphanyl phenols, a set of fourteen new C 2-symmetric diphosphine ligands was synthesized. In addition, three related ligands were obtained from ortho-diphenylphosphino-anilines. The fully characterized ligands were then tested in the Pd-catalyzed enantioselective O-allylation of 4-methoxyphenol using crotyl methyl carbonate as a reagent. In addition, a pseudo-intramolecular variant of the reaction, using crotyl 4-methoxyphenyl carbonate as a substrate, was studied. The so-called Trost ligand was used as a reference. Although the Trost ligand (3 mol-%) gave up to 84% ee, one of the new ligands showed higher activity (50% ee with 0.075 mol-%). Copyright
