syn stereocontrol in the directed dihydroxylation of acyclic allylic alcohols
作者:Timothy J. Donohoe、Nicholas J. Newcombe、Michael J. Waring
DOI:10.1016/s0040-4039(99)01371-4
日期:1999.9
The preparation and directed dihydroxylation of a series of acyclic allylicalcohols is reported. The oxidation reaction is capable of demonstrating high levels of diastereoselection for the syn isomer. An explanation of the observed selectivities based on the degree of allylic strain is presented and a transition state model proposed.
Molybdenum-Catalyzed Hydroxyl-Directed <i>Anti</i>-Dihydroxylation of Allylic and Homoallylic Alcohols
作者:Pei Fan、Shixia Su、Chuan Wang
DOI:10.1021/acscatal.8b01449
日期:2018.8.3
A catalytic hydroxyl-directed anti-dihydroxylation of allylic and homoallylic alcohols has been developed. This operationally simple method was successfully applied to the direct anti-monodihydroxylation of allylic alcohols containing at least one distal olefinic unit. Under the catalysis of commercially available MoO2(acac)2, an array of hydroxylated dienes were successfully converted into various
The <sup>1</sup>H NMR Method for the Determination of the Absolute Configuration of 1,2,3-<i>p</i><i>rim</i>,<i>s</i><i>ec</i>,<i>s</i><i>ec-</i>Triols
作者:Enrique Lallana、Félix Freire、José Manuel Seco、Emilio Quiñoá、Ricardo Riguera
DOI:10.1021/ol0616135
日期:2006.9.1
comparison of the 1HNMR spectra of the tris-(R)- and the tris-(S)-MPA ester derivatives. An experimental demonstration of this correlation with 24 triols of known absolute configuration and a protocol using two parameters-Deltadelta(RS)(H3) and the difference between Deltadelta RS (H2) and Deltadelta RS (H3) = absolute value (Delta(Deltadelta RS))-for its application to the determination of the absolute
Stereocontrol by Quaternary Centres: A Stereoselective Synthesis of (−)-Luminacin D
作者:Nathan Bartlett、Leona Gross、Florent Péron、Daniel J. Asby、Matthew D. Selby、Ali Tavassoli、Bruno Linclau
DOI:10.1002/chem.201304776
日期:2014.3.17
can be achieved by 1,3‐chelation‐controlled allylation of aldehydes that possess a non‐chelating α‐ether substituent, even if the α‐position is a quaternarycentre and/or a spiro‐epoxide. This reaction was used as a key step in an enantioselective synthesis of the angiogenesis inhibitor luminacin D.
First stereoselective total synthesis and anticancer activity of new amide alkaloids of roots of pepper
作者:Ch. Srinivas、Ch.N.S. Sai Pavan Kumar、B. China Raju、V. Jayathirtha Rao、V.G.M. Naidu、S. Ramakrishna、Prakash V. Diwan
DOI:10.1016/j.bmcl.2009.08.056
日期:2009.10
The first stereoselectivetotalsynthesis of new natural amide alkaloids 1–3 have been achieved from commercially available starting materials. Wittig olefination, Sharpless asymmetric dihydroxylation, epoxidation, a trans regioselective opening of 2,3-epoxy alcohol, Horner–Wadsworth–Emmons (HWE) olefination and amide coupling are the key steps. The amide alkaloids 1–3 are evaluated for their anticancer