Synthesis of new (R)-secondary carbinols with different structures via enzymatic resolution
摘要:
The present study deals with the biocatalytic enantioselective synthesis of 19 new chiral alcohols with alkyl (C-11-C-19) and phenyl, substituted phenyl, heteroaromatic, and naphthyl groups 4a-4z with an (R)-configuration and high enantiomeric excess (similar to 100%). The corresponding ketones 1a-1z were synthesized and then reduced with NaBH4 to their racemic alcohols 2a-2z, which were converted into their racemic acetyl derivatives 3a-3z. Enzymes of four different types were used for the enantioselective hydrolysis of these acetyl compounds 3a-3z. The optimal reaction conditions for these four enzymes were established by investigating the enantiomeric excesses by chiral HPLC. Amano lipase from Burkholderica cepacia (Pseudomonas cepacia) AL-PS was determined as the best enzyme in this work This study presents an environmentally friendly and green chemistry method for the synthesis of these new (R)-chiral carbinols 4a-4z. (C) 2011 Elsevier Ltd. All rights reserved.
Synthesis of new (R)-secondary carbinols with different structures via enzymatic resolution
摘要:
The present study deals with the biocatalytic enantioselective synthesis of 19 new chiral alcohols with alkyl (C-11-C-19) and phenyl, substituted phenyl, heteroaromatic, and naphthyl groups 4a-4z with an (R)-configuration and high enantiomeric excess (similar to 100%). The corresponding ketones 1a-1z were synthesized and then reduced with NaBH4 to their racemic alcohols 2a-2z, which were converted into their racemic acetyl derivatives 3a-3z. Enzymes of four different types were used for the enantioselective hydrolysis of these acetyl compounds 3a-3z. The optimal reaction conditions for these four enzymes were established by investigating the enantiomeric excesses by chiral HPLC. Amano lipase from Burkholderica cepacia (Pseudomonas cepacia) AL-PS was determined as the best enzyme in this work This study presents an environmentally friendly and green chemistry method for the synthesis of these new (R)-chiral carbinols 4a-4z. (C) 2011 Elsevier Ltd. All rights reserved.
Switchable β-alkylation of Secondary Alcohols with Primary Alcohols by a Well-Defined Cobalt Catalyst
作者:Bedraj Pandey、Shi Xu、Keying Ding
DOI:10.1021/acs.organomet.1c00147
日期:2021.5.10
β-alkylation of secondaryalcohols with primaryalcohols to selectively generate alcohols by a well-defined Co catalyst is presented. Remarkably, a low catalyst loading of 0.7 mol % can be employed for the reaction. More significantly, this study represents the first Co-catalyzed switchable alcohol/ketone synthesis by simply manipulating the reaction parameters. In addition, the transformation is environmentally
Not borrowed: A new method was developed for the cross‐coupling of two different alcohols (see scheme). This carbon–carbonbondformation was realized by using a small amount of CuBr (0.05–0.2 mol %) and NaOH (4–20 mol %) in the presence of H2 (1 atm), and provides an alternative procedure for longer‐chain alcohols. The catalytic cycle was different from those reported to date for the Guerbet reaction
Breusch; Oguzer, Chemische Berichte, 1954, vol. 87, p. 1225,1227, 1228
作者:Breusch、Oguzer
DOI:——
日期:——
Synthesis of new (R)-secondary carbinols with different structures via enzymatic resolution
作者:Tülay Yıldız、Ayşe Yusufoğlu
DOI:10.1016/j.tetasy.2011.07.017
日期:2011.6
The present study deals with the biocatalytic enantioselective synthesis of 19 new chiral alcohols with alkyl (C-11-C-19) and phenyl, substituted phenyl, heteroaromatic, and naphthyl groups 4a-4z with an (R)-configuration and high enantiomeric excess (similar to 100%). The corresponding ketones 1a-1z were synthesized and then reduced with NaBH4 to their racemic alcohols 2a-2z, which were converted into their racemic acetyl derivatives 3a-3z. Enzymes of four different types were used for the enantioselective hydrolysis of these acetyl compounds 3a-3z. The optimal reaction conditions for these four enzymes were established by investigating the enantiomeric excesses by chiral HPLC. Amano lipase from Burkholderica cepacia (Pseudomonas cepacia) AL-PS was determined as the best enzyme in this work This study presents an environmentally friendly and green chemistry method for the synthesis of these new (R)-chiral carbinols 4a-4z. (C) 2011 Elsevier Ltd. All rights reserved.