928-40-5Relevant articles and documents
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Voitsekhovskaya,A.L. et al.
, (1966)
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Enantioselective Synthesis Muqubilin and Negombatoperoxides B and C/D
Wang, Xiao-Tao,Wu, Yikang
, p. 4205 - 4219 (2021/03/01)
Muqubilin, negombatoperoxide B, and negombatoperoxide C/D were synthesized through enantioselective routes, with the quaternary center derived from a peroxy chiral building block of known absolute configuration. The C-2/C-3 stereogenic centers were introduced by asymmetric aldol condensation, and the 1,2-dioxane ring was constructed via an intramolecular alkylation of a hydroperoxide with a mesylate. The synthetic samples showed physical and spectroscopic data consistent with those reported in the literature and thus verified the configurations of the natural products. A potentially more expeditious enantioselective entry to the 1,2-dioxane-aldol moiety (C-1 to C-6) of such cyclic peroxides was also briefly explored, where the C-2/C-3 stereogenic centers were installed through a [2+2] cycloaddition and the 1,2-dioxane ring was closed via an intramolecular alkylation coupled with an alkyl-oxygen cleavage of a β-lactone.
Metal complex and preparation method and application thereof
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Paragraph 0034; 0049; 0054, (2019/06/07)
The invention discloses a post-transition metal bisphosphine diamine complex catalyst which is good in substrate applicability, and capable of efficiently catalyzing a hydrogenation alcohol productionreaction of various carbonyl derivatives such as esters, amides and carbonates different in structure. Central metal coordination of the metal complex catalyst has two diaminodiphosphine ligands o-PPh2C6H4NR1R2 and Ph2PCH2CH2NR3R4 (or o-PPh2C6H4CH2NR3R4, Ph2P(CH2) 3NR3R4) different in structure, and the metal complex can be obtained through a simple two-step synthesis method. The catalysts show the advantages of the two ligands in the catalytic hydrogenation process, and the defects of a complex catalyst formed by a single ligand in the aspect of applicability of substrates can be effectivelyovercome.