Steric Parameters in the Ir-Catalyzed Regio- and Diastereoselective Isomerization of Primary Allylic Alcohols
摘要:
The iridium-catalyzed diastereo- and regioselective isomerization of primary allylic alcohols using Crabtree's catalyst or sterically modified analogs is reported. The importance of the size of the substituents on either the substrates or the catalysts has been rationalized by linear free energy relationships.
Dynamic reductive kinetic resolutions of racemic 3‐arylalkanones have been performed by the proper combination of an alcohol dehydrogenase and a basic anionic resin. The best results were found for the bioreduction with the alcohol dehydrogenase type A from Rhodococcus ruber DSM 44541 overexpressed in Escherichia coli (E. coli/ADH‐A) and the commercially available evo‐1.1.200, while the Amberlite IRA‐440
外消旋3-芳基链烷酮的动态还原动力学拆分已通过适当地结合使用醇脱氢酶和碱性阴离子树脂来实现。对于在大肠杆菌(E.coli / ADH-A)和市售evo-1.1.200中过表达的红球菌DSM 44541中的A型醇脱氢酶进行生物还原,发现了最佳结果,而Amberlite IRA-440 C和Amberlite IRA-440 C DOWEX‐MWA-1树脂可实现高效的原位外消旋。根据酶的来源和负载量,树脂的类型和数量,pH,温度和反应时间对反应条件进行了优化,获得了一系列(R,R)取代的propan-2-ols,具有良好的转化率以及非对映选择性和立体选择性。作为概念证明,随后对选定的propan-2-ol底物进行分子内环化,可得到有价值的异色满杂环,而不会损失光学纯度。
Formation and reactions of 1-phenyl-2-propanone dianion and related systems with electrophilic reagents
作者:G. B. Trimitsis、J. M. Hinkley、R. TenBrink、A. L. Faburada、R. Anderson、M. Poli、B. Christian、G. Gustafson、J. Erdman、D. Rop
DOI:10.1021/jo00166a004
日期:1983.9
Calas,B.; Giral,L., Bulletin de la Societe Chimique de France, 1971, p. 2629 - 2635
作者:Calas,B.、Giral,L.
DOI:——
日期:——
TRIMITSIS, G. B.;HINKLEY, J. M.;TENBRINK, R.;FABURADA, A. L.;ANDERSON, R.+, J. ORG. CHEM., 1983, 48, N 18, 2957-2962
作者:TRIMITSIS, G. B.、HINKLEY, J. M.、TENBRINK, R.、FABURADA, A. L.、ANDERSON, R.+