Enantioselective Bio‐Hydrolysis of Geranyl‐Derived rac‐Epoxides: A Chemoenzymatic Route to trans‐Furanoid Linalool Oxide
作者:Matthijs van Lint、Aysegül Gümüs、Eelco Ruijter、Kurt Faber、Romano Orru、Mélanie Hall
DOI:10.1002/adsc.201801094
日期:——
many chemical dihydroxylation methods, enzymatic epoxidehydrolysis provides an environmentally benign route to vicinaldiols, which are important intermediates in the synthesis of fine chemicals and pharmaceuticals. Usingepoxidehydrolases, enantiopurediols are accessible under mild conditions. In order to assess the selectivity of epoxidehydrolases on geraniol‐derived oxiranes, a range of derivatives
作者:Timothy J. Donohoe、Peter R. Moore、Michael J. Waring、Nicholas J. Newcombe
DOI:10.1016/s0040-4039(97)01061-7
日期:1997.7
The preparation and dihydroxylation of a series of polyenes and cyclicallylicalcohols using the TMEDA/osmium tetroxide mixture is reported. Remarkably, these reagents lead to high levels of regiochemical and stereochemical control as the oxidant hydrogen-bonds to the allylicalcohol group. A mechanistic hypothesis is presented which invokes the formation of a reactive, bidentate complex between osmium
Study of the regio- and enantioselectivity of the reactions of osmium tetroxide with allylic alcohols and allylic sulfonamides
作者:Daqiang Xu、Christine Y. Park、K.Barry Sharpless
DOI:10.1016/s0040-4039(00)77153-x
日期:1994.4
geranyl sulfonamides suggest the presence of a moderate attractive interaction between OsO4 and the allylic groups bearing acidic protons. This allylic directing effect may be due to the development of a hydrogen bonding interaction between OsO4 and the substrates during the osmylation process. The potential for a hydrogen bond can also have a substantial effect on the enantioselectivities of the osmium
The asymmetric dihydroxylation of geranyl acetate, neryl acetate and trans, trans -farnesyl acetate was studied using the new Sharpless' ligands (DHQD)2-PHAL and (DHQ)2-PHAL. High enantioselectivity was always observed. High positional selectivity for the 6,7-olefin was observed in the case of the monoterpene acetates.
Xu Daqiang, Park Christine Y., Sharpless K. Barry, Tetrahedron Lett, 35 (1994) N 16, S 2495-2498
作者:Xu Daqiang, Park Christine Y., Sharpless K. Barry