Enzyme catalyzed reverse enantiomeric separation of methyl (+/-)-3-cyclohexene-1-carboxylate

We describe the differences of hydrolase-type enzymes pig liver esterase (PLE), horse liver esterase (HLE), and porcine pancreatic lipase (PPL) on the hydrolysis of methyl (+/-)-3-cyclohexene-1-carboxylate to afford both enantiomers with 89% to > 99% ee. The resultant enantiomerically pure (S)-(-)-3-cyclohexene-1-carboxylic acid was transformed into (1S,5S)-(-)-5-(hydroxymethyl)-2-cyclohexen-1-ol via iodolactonization, subsequent elimination of iodine with 1,8-diazibicyclo[5.4.0]undec-7-ene (DBU) and reduction with lithium aluminum hydride (LAH).


A bis-Lewis basic 2-aminoDMAP/prolinamide organocatalyst for application to the enantioselective synthesis of Warfarin and derivatives
IŞIK, Murat; Akkoca, H. Ufuk; Akhmedov, I. Mecidoglu; Tanyeli, Cihangir (Elsevier BV, 2016-06-01)
A new chiral sec-amine/amidine-base hybrid catalyst, 2-aminoDMAP/prolinamide, is reported, which is able to catalyze conjugate addition of 4-hydroxycoumarin and various benzylideneacetones, a reaction that directly gives anticoagulant Warfarin and its analogues, with good yields (70-87%) and enantioselectivities (58-72%).
Amination/annulation of chlorobutenones with chiral amine compounds: synthesis of 1,2,4-trisubstituted pyrroles
Demir, Ayhan Sıtkı; Igdir, AC; Gunay, NB (Elsevier BV, 2005-10-03)
A series of 1,2,4-trisubstituted pyrroles have been synthesized in 83-96% yields on treatment of chiral primary amines, amino alcohols and esters of alpha-amino acids with different chlorobutenones in benzene-triethylamine. The conversions proceed without racemization.
Intermolecular one-pot cyclization of formyl-pyrroles of amino acid esters with norephedrine: stereoselective routes to new tricyclic pyrrole-pyrazine-oxazole fused structures
Demir, Ayhan Sıtkı; Subasi, N. Tuna; Sahin, Ertan (Elsevier BV, 2006-10-16)
The treatment of esters of amino acids with dimethoxytetrahydrofuran furnished pyrrole derivatives of amino acid esters. The Wilsmeier-Haack formylation followed by the reaction of the formylated pyrroles with norephedrine afforded a selective formation of the tricyclic pyrrole-pyrazine-oxazole fused structures in one step via the formation of an oxazoline structure and intramolecular lactam formation. Pyrrole-pyrazine-oxazole fused structures were achieved in good yields. The cyclization reaction for the f...
Enzyme-catalyzed resolution of aromatic ring fused cyclic tertiary alcohols
Ozdemirhan, Devrim; Sezer, Serdar; Sonmez, Yasemin (Elsevier BV, 2008-12-01)
An efficient chemoenzymatic route for the synthesis of optically active aromatic ring fused cyclic tertiary alcohols (S)-(-)-1-methyl-1,2,3,4-tetrahydronaphthalen-1-ol (-)-1b and (S)-(+)-1-methyl-2,3-dihydro-1H-inden-1-ol (+)-1a has been developed. Different lipases have been tested in the transesterification of these tertiary alcohols; CAL-A (Candida antarctica Lipase A) was found to be the best biocatalyst for 1b and CAL-A-CLEA (Lipase A, C. antarctica, cross-linked enzyme aggregate) for la, obtained with...
Chemoenzymatic synthesis of alpha(1)- and alpha-acetoxylated cyclic ketones
Tanyeli, Cihangir; Akhmedov, M (Elsevier BV, 2004-06-07)
alpha,beta-Unsaturated and saturated cyclic ketones were selectively oxidized at the alpha'- and alpha-positions using Mn(OAc)(3) and Pb(OAc)(4), respectively, resulting in high chemical yields. The resultant racemic alpha'- and alpha-acetoxylated substrates were resolved into corresponding enantiomerically enriched alpha'- and alpha-hydroxylated and acetoxylated compounds with 96-98% ee via PLE hydrolysis. The absolute configurations of alpha'-acetoxy-alpha,beta-unsaturated cyclic ketones were determined b...
Citation Formats
C. Tanyeli, “Enzyme catalyzed reverse enantiomeric separation of methyl (+/-)-3-cyclohexene-1-carboxylate,” TETRAHEDRON-ASYMMETRY, pp. 2057–2060, 2004, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/42528.