[EN] PROCESSES FOR THE PREPARATION OF PHENYLTETRAHYDROFURAN COMPOUNDS [FR] PROCÉDÉS DE PRÉPARATION DE COMPOSÉS À BASE DE PHÉNYLTÉTRAHYDROFURANE
摘要:
Provided are phenyltetrahydrofuran compounds that are useful as intermediates in the preparation of pharmaceutical compounds and further provided are processes for the preparation of phenyltetrahydrofuran compounds.
C1-symmetric chiral bisphosphine, FcPh-Binap (1), which possesses a single diferrocenylphosphino moiety together with a conventional Ph2P-substituent, was prepared in enantiomericallypure forms. Ligand 1 is sterically less demanding than Fc-Segphos (A), which has two diferrocenylphosphino groups, and showed higher activity than A in the rhodium-catalyzed asymmetric conjugate addition of phenylboronic
Enantio- and Regioselective Heck-Type Reaction of Arylboronic Acids with 2,3-Dihydrofuran
作者:Liza Penn、Alina Shpruhman、Dmitri Gelman
DOI:10.1021/jo070170v
日期:2007.5.1
Reported herein is a protocol for the enantioselective Pd(II)-catalyzed Heck-typereaction between arylboronicacids and 2,3-dihydrofuran. The highest chemical and optical yields were obtained when a Pd(OAc)2/(R)-MeO(biphenylphosphine) or a Pd(OAc)2/(R)-(2,2‘-bis(diphenylphosphino)-1,1‘-binaphthyl) catalyst and a Cu(OAc)2 reoxidant were employed.
Two enantiopure fluorous phosphines have been conveniently synthesized by combining palladium-catalyzed coupling reactions of easily available binaphthyl building-blocks with the introduction of fluorous ponytails onto aromatic compounds via ether bond formation. These new fluorous chiralphosphines have been tested as ligands in metal-catalyzed asymmetric transformations, the best results being obtained
Palladium-catalyzed asymmetric arylation of 2,3-dihydrofuran: 1,8-Bis(dimethylamino)naphthalene as an efficient base
作者:Fumiyuki Ozawa、Akihiko Kubo、Tamio Hayashi
DOI:10.1016/s0040-4039(00)91654-x
日期:1992.3
Reaction of 2,3-dihydrofuran with aryl triflate (1) in the presence of a base and a palladium catalyst, generated in situ from Pd(OAc)2 and (R)-BINAP, gave (R)-2-aryl-2,3-dihydrofuran (2) and a small amount of (S)-2-aryl-2,5-dihydrofuran (3). The enantiomeric purity of major product 2 was strongly affected by the base. 1,8-Bis(dimethylamino)naphthalene (proton sponge) as a highlybasic and sterically