Highly diastereo- and enantio-selective epoxidation of secondary allylic alcohols catalyzed by styrene monooxygenase
作者:Hui Lin、Yan Liu、Zhong-Liu Wu
DOI:10.1039/c0cc04360e
日期:——
Enantiomerically enriched glycidol derivatives with contiguous stereogenic centers were obtained in a highly diastereo- and enantio-selective epoxidation catalyzed with the styrene monooxygenase StyAB2.
A new method for CuF-catalyzed alkenylation and phenylation of aldehydes and an activated ketone using air- and moisture-stable alkenylsilanes and phenylsilane as a nucleophile is described. This methodology was extended to highly enantioselective catalytic alkenylation and phenylation using DTBM-SEGPHOS as a chiral ligand. Substrate generality is broad, and an alkenylsilane with a long alkyl chain
作者:Stefania F. Musolino、O. Stephen Ojo、Nicholas J. Westwood、James E. Taylor、Andrew D. Smith
DOI:10.1002/chem.201604788
日期:2016.12.23
The non‐enzymatic acylative kineticresolution of challenging aryl–alkenyl (sp2 vs. sp2) substituted secondaryalcohols is described, with effective enantiodiscrimination achieved using the isothiourea organocatalyst HyperBTM (1 mol %) and isobutyric anhydride. The kineticresolution of a wide range of aryl–alkenyl substituted alcohols has been evaluated, with either electron‐rich or naphthyl aryl
描述了具有挑战性的芳基-烯基(sp 2与 sp 2 )取代的仲醇的非酶酰化动力学拆分,并使用异硫脲有机催化剂 HyperBTM(1 mol%)和异丁酸酐实现了有效的对映区分。已经评估了各种芳基-烯基取代醇的动力学拆分,其中富电子或萘基芳基取代基与未取代的乙烯基取代基相结合,提供了最高的选择性( S =2-1980)。演示了使用该方案对模型芳基-乙烯基(sp 2与 sp 2 )取代的仲醇进行克级(2.5 g)动力学拆分,可获取每种产物对映体的 >1 g 99:1呃。
Stereoselective synthesis of optically active cyclopenta[c]pyrans and cyclopenta[c]furans by the intramolecular Pauson–Khand reaction
作者:Serdar Sezer、Ertan Şahin、Cihangir Tanyeli
DOI:10.1016/j.tetasy.2010.02.016
日期:2010.3
An intramolecular Pauson–Khand reaction of enynes derived from homoallyl, homopropargyl, and allyl alcohols is described. 2-Heteroaryl-substituted homoallyl, homopropargyl, and allyl alcohols are easily and efficiently resolved through enzymatic resolution in high ee (91–99%) and with a known stereochemistry. Each enantiomerically enriched enyne derived from homoallyl and homopropargyl alcohols affords
描述了由高烯丙基,高炔丙基和烯丙醇衍生的烯炔的分子内Pauson-Khand反应。2-杂芳基取代的均烯丙基,高炔丙基和烯丙醇可以通过高ee(91-99%)的酶解和已知的立体化学方法轻松高效地拆分。从高烯丙基和高炔丙基醇,得到构象最稳定的非对映体环戊二烯并[导出的各对映体富集的烯炔Ç ]吡喃环系统作为唯一的产物,而由烯丙基醇得到非对映体衍生的对映体富集烯炔顺:反式的环戊二烯的混合物[ C ^ ]呋喃铃声系统。
Kinetic resolution of allylic alcohols via stereoselective acylation catalyzed by lipase PS-30
作者:Peiran Chen、Peng Xiang
DOI:10.1016/j.tetlet.2011.08.093
日期:2011.11
By using lipase PS-30 as catalyst, the kineticresolution of a series of racemic allylic alcohols has been achieved via stereoselective acylation. The value of kinetic enantiomeric ratio (E) reached up to 968. Substituent effect is briefly discussed.