Regioselective nucleophilic ring opening of epoxides and aziridines derived from homoallylic alcohols
作者:David Tanner、Thomas Groth
DOI:10.1016/s0040-4020(97)10053-9
日期:1997.11
of the nucleophile to C-3 via a six-membered transition state, leading to 1,4-diols or 1,4-amino alcoholderivatives. In general, the epoxy alcohols gave poorer regioselectivity than the N-tosyl aziridino alcohols, for which selectivities of >95:5 were routinely obtained. The activating effect of a phenyl group at C-4 led to a switch in regiochemistry, with the 1,3-diol or 1,3-amino alcohol derivative
Ligand-Controlled, Norbornene-Mediated, Regio- and Diastereoselective Rhodium-Catalyzed Intramolecular Alkene Hydrosilylation Reactions
作者:Yuanda Hua、Hiep H. Nguyen、William R. Scaggs、Junha Jeon
DOI:10.1021/ol401464n
日期:2013.7.5
Ligand-controlled, norbornene-mediated, regio- and diastereoselective rhodium-catalyzed intramolecular alkenehydrosilylation of homoallyl silyl ethers (1) exploiting either BINAP or 1,6-bis(diphenylphosphino)hexane (dpph) has been developed. This method permits selective access to either trans-oxasilacyclopentanes (trans-2) or oxasilacyclohexanes (3) at will. A substoichiometric amount of norbornene
Fe(III)‐Catalyzed Aerobic Oxidation of 1,4‐Diols<sup>†</sup>
作者:Junlin Li、Jinxian Liu、Chunling Fu、Shengming Ma
DOI:10.1002/cjoc.202200768
日期:2023.8.15
Aerobic oxidation has been catching more and more attention because of its atom economy and environmental friendliness. Oxidation of diols is a challenge due to various oxidative products. Thus, highly selective aerobic oxidation affording specific products is of current interest. In this work, a combination of Fe(NO3)3·9H2O/TEMPO/KCl catalysis has been identified as an efficient recipe for the aerobic
enantioconvergent access to chiral N-heterocycles directly from simple racemic diols and primary amines, through a highly economical borrowing hydrogen annulation. The identification of a chiral amine-derived iridacycle catalyst was the key for achieving high efficiency and enantioselectivity in the one-step construction of two C–N bonds. This catalytic method enabled a rapid access to a wide range of
The present invention relates to a novel polyurethane, copolyether ester or copolyether amide elastomer composition comprising a glycol derived from random copolymerization of alkylene oxide and tetrahydrofuran (THF), the alkylene oxide having from 2 to 4 carbon atoms, i.e., poly(tetramethylene-co-alkyleneether) glycol.