LOW-MOLECULAR COMPOUND, POLYMER, MATERIAL FOR ELECTRONIC DEVICES, COMPOSITION FOR ELECTRONIC DEVICES, ORGANIC ELECTROLUMINESCENT ELEMENT, ORGANIC SOLAR CELL ELEMENT, DISPLAY AND LIGHTING EQUIPMENT
The cyclisation conditions for the formation of bicyclo[2.2.2]octan-2,6-di one (1) from 3-substituted cyclohexanones 2 and 3 have been re-investigated. Use of a medium consisting of isobutyric anhydride and trifluoroacetic acid resulted in a simplified and reproducible method for large-scale synthesis of this compound.
An unprecedented remote effect of the hydroxyl group on π-facial selectivity was observed in the addition of Grignard reagents to bicyclo[2.2.2]octan-2-ones, where nucleophilic attack occured from the slerically more hindered face.
Microorganisms for Producing Cyclohexanone and Methods Related Thereto
申请人:Burgard Anthony
公开号:US20120329111A1
公开(公告)日:2012-12-27
Provided herein is a non-naturally occurring microbial organism having a cyclohexanone pathway and comprising at least one exogenous nucleic acid encoding a cyclohexanone pathway enzyme. Also provided herein is a method for producing cyclohexanone, including culturing these non-naturally occurring microbial organisms.
A non-naturally occurring microbial organism has cyclohexanone pathways that include at least one exogenous nucleic acid encoding a cyclohexanone pathway enzyme. A pathway includes a 2-ketocyclohexane-1-carboxyl-CoA hydrolase (acting on C—C bond), a 2-ketocyclohexane-1-carboxylate decarboxylase and an enzyme selected from a 2-ketocyclohexane-1-carboxyl-CoA hydrolase (acting on thioester), a 2-ketocyclohexane-1-carboxyl-CoA transferase, and a 2-ketocyclohexane-1-carboxyl-CoA synthetase. A pathway includes an enzyme selected from a 6-ketocyclohex-1-ene-1-carboxyl-CoA hydrolase (acting on C—C bond), a 6-ketocyclohex-1-ene-1-carboxyl-CoA synthetase, a 6-ketocyclohex-1-ene-1-carboxyl-CoA hydrolase (acting on thioester), a 6-ketocyclohex-1-ene-1-carboxyl-CoA transferase, a 6-ketocyclohex-1-ene-1-carboxyl-CoA reductase, a 6-ketocyclohex-1-ene-1-carboxylate decarboxylase, a 6-ketocyclohex-1-ene-1-carboxylate reductase, a 2-ketocyclohexane-1-carboxyl-CoA synthetase, a 2-ketocyclohexane-1-carboxyl-CoA transferase, a 2-ketocyclohexane-1-carboxyl-CoA hydrolase (acting on thioester), a 2-ketocyclohexane-1-carboxylate decarboxylase, and a cyclohexanone dehydrogenase. A pathway includes an adipate semialdehyde dehydratase, a cyclohexane-1,2-diol dehydrogenase, and a cyclohexane-1,2-diol dehydratase. A pathway includes a 3-oxopimelate decarboxylase, a 4-acetylbutyrate dehydratase, a 3-hydroxycyclohexanone dehydrogenase, a 2-cyclohexenone hydratase, a cyclohexanone dehydrogenase and an enzyme selected from a 3-oxopimeloyl-CoA synthetase, a 3-oxopimeloyl-CoA hydrolase (acting on thioester), and a 3-oxopimeloyl-coA transferase. Each these pathways can include a PEP carboxykinase. A method for producing cyclohexanone includes culturing these non-naturally occurring microbial organisms.
An Improved Procedure for the Synthesis of Bicyclo[2.2.2]octane-2,6-dione
作者:Fredrik Almqvist、Lars Eklund、Torbjöm Frejd
DOI:10.1080/00397919308011243
日期:1993.6
Abstract Conjugate addition of Meldrum's acid to 2-cyclohexenone followed by direct cyclization in PPA/acetic acid constitutes a shorter, more reproducible and higher yielding route to bicyclo[2.2.2]octane-2,6-dione than previous methods. The crude dione could be used as substrate for the baker's yeast reduction to (1R, 4S, 6S)-bicyclo[2.2.2]octane-6-ol-2-one.