Synthesis of stereoisomeric crown ethers composed of cis- and trans-2,5-bis(hydroxymethyl)tetrahydrofuran units and their selective transport of alkali metal cations through liquid membranes
Synthesis of stereoisomeric crown ethers composed of cis- and trans-2,5-bis(hydroxymethyl)tetrahydrofuran units and their selective transport of alkali metal cations through liquid membranes
Enzyme-catalyzed asymmetric acylation and hydrolysis of cis-2,5-disubstituted tetrahydrofuran derivatives: Contribution to development of models for reactions catalyzed by porcine liver esterase and porcine pancreatic lipase
Pig liver esterase, lipase from porcine pancreas, lipase from Pseudomonas sp. (lipase YS), and lipase from Candida cylindracea catalyzed hydrolyses of the cis-diacetate 1 and the trans-diacetate (+/-)-4 to give the cis-monoacetate 3 and the trans-monoacetate 6 in optically active forms, respectively. Lipase YS-catalyzed acylations of the cis-diol 2 and the trans-diol (+/-)-5 with an acylating agent in cyclohexane yielded (-)-3 and (-)-6, respectively. The group adjacent to the R stereogenic center preferentially reacted in lipase YS-catalyzed hydrolyses of 1 and (+/-)-4 and acylations of 2 and (+/-)-5, and the enantioselectivities are rationalized by our rule recently proposed for lipase YS.
Synthesis of stereoisomeric crown ethers composed of cis- and trans-2,5-bis(hydroxymethyl)tetrahydrofuran units and their selective transport of alkali metal cations through liquid membranes