ether-oxygen to the stereogenic quaternary carbon center of the oxirane ring had a profound influence on the enantioselectivity, and several oxiranes were resolved with good to excellent selectivities. The enantiomerically enriched epoxides and vicinal diols thus obtained contain a useful “synthetic handle” in their side chain, which allows their use as buildingblocks in asymmetric synthesis.
Two C2-symmetric chiralcrownethers, (2 S,12 S)-2,12-bis(hydroxymethyl)-2,12-dimethyl-18-crown-6 and (2 R,9 R)-2,9-bis(hydroxymethyl)-2,9-dimethyl-18-crown-6 were synthesized from a chiral subunit, [(4 S)-2,2,4-trimethyl-1,3-dioxolane-4-yl]methanol, at high enantiomeric purity over several steps. This synthetic method offers the potential to construct a variety of C2-symmetric chiralcrownethers
Development of a Multikilogram Synthesis of a Chiral Epoxide Precursor to a CCR1 Antagonist. Use of in Situ Monitoring for Informed Optimisation via Fragile Intermediates
作者:Debra Ainge、James E. M. Booker、Nicholas Pedge、Rhona Sinclair、Chris Sleigh、Marijan Štefinović、Luis-Manuel Vaz、Edward Way
DOI:10.1021/op900172t
日期:2010.1.15
up of a manufacturing route to a key intermediate, aceticacid 4-acetylamino-3-(2-methyl-oxiranylmethoxy)phenyl ester (2), utilising a SNAr coupling, the hydrogenation of a nitro moiety and the conversion of a chiral acetonide into a chiral epoxide is described along with other routes to access intermediate 2 including the chemoselective reduction of a nitro moiety in the presence of an epoxide.
利用S N Ar偶合,硝基部分的加氢和乙酸的最优化和规模化生产关键中间体乙酸4-乙酰氨基-3-(2-甲基-环氧乙烷基甲氧基)苯基酯(2)的方法。描述了手性丙酮化物向手性环氧化物的转化以及进入中间体2的其他途径,包括在环氧化物的存在下硝基部分的化学选择性还原。
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
2-butylglycerol, and/or 2-methyl fattyacids were synthesized. The triacylglycerol analogues were tested for their ability to form stable monomolecularfilms at the air/waterinterface by recording their surface-pressure/molecular-area compression isotherms. The inhibition of human pancreatic and gastric lipases by the sterically hindered triacylglycerol analogues was studied by using the monolayer