Ring opening of epoxides with NaHSO4: isolation of β-hydroxy sulfate esters and an effective synthesis for trans-diols
摘要:
Sodium hydrogen sulfate (NaHSO4) was observed to be highly effective as a reagent or catalyst in the ring-opening reactions of epoxides under mild conditions. Reaction of epoxides with NaHSO4 gave isolable P-hydroxy sulfate esters and vicinal diols. Experimenting with different epoxides, the study investigated the scope of the ring-opening reaction. (C) 2008 Elsevier Ltd. All rights reserved.
Palladium(0) catalyzed reaction of 1,3-diene 1,4-epiperoxides
作者:M. Suzuki、Y. Oda、R. Noyori
DOI:10.1016/s0040-4039(01)82971-3
日期:1981.1
Reaction of 1,3-diene 1,4-epiperoxides with Pd(PPh3)4 catalyst forms the corresponding 4-hydroxy enones, syn diepoxides, and 1,4-diols as the major products. The results are interpreted as being due to competing Pd(0)/Pd(II) and Pd(0)/Pd(I) exchange mechanisms.
(±)-<i>trans</i>,<i>cis</i>-4-Hydroxy-5,6-di-<i>O</i>-isopropylidenecyclohex-2-ene-1-one: Synthesis and Facile Dimerization to Decahydrodibenzofurans
作者:Victoria L. Paddock、Robert J. Phipps、Almudena Conde-Angulo、Araceli Blanco-Martin、Carles Giró-Mañas、Laetitia J. Martin、Andrew J. P. White、Alan C. Spivey
DOI:10.1021/jo102314w
日期:2011.3.4
acetonide-protected meso-1,2-dihydrocatechol derivative 1 via photooxygenation, then Kornblum−DeLaMare rearrangement. The product is unstable unless its 4-hydroxy group is protected, as it undergoes faciledimerization in solution to a 1:1 mixture of diastereoisomeric decahydrodibenzofurans 8 and 9. A new synthesis of the dihydrocatechol 1 from 1,3-cyclohexadiene has also been developed.
Synthesis and structure of all-syn-1,2,3,4-tetrafluorocyclohexane
作者:Alastair J. Durie、Alexandra M. Z. Slawin、Tomas Lebl、Peer Kirsch、David O'Hagan
DOI:10.1039/c1cc13016a
日期:——
Preparation of the all-syn isomer of 1,2,3,4-tetrafluorocyclohexane is reported; X-ray structural studies shows a conformation with two of the C-F bonds oriented 1,3-diaxial to each other and (19)F-NMR reveals a through space diaxial (4)J(FF) coupling constant of 29 Hz.
Thermal, and especially photochemical, rearrangement of the endoperoxides (1) and (5)–(11) gives βγ-epoxycycloalkanones as primary products, accompanied by the expected syn-diepoxides.