The synthesis of the trans-p-menthan-5-ol (+/-)-1 was carried out by Diels-Alder cycloaddition of 3-keto-1-butenyl-acetate 3 with isoprene followed by Wittig methylenation. PS lipase resolution of the alcohol afforded acetate (-)-5 with 98% ec, which was hydrolysed to give (-)1. Alternatively, enzymatic hydrolysis of a keto ester followed by Wittig methylenation and hydrolysis afforded the same alcohol with an ee of 86%. The cis-p-menthan-5-ol (-)-2 was obtained by Swern oxidation of (-)-1. followed by diastereoselective reduction with L-Selectride without lost of enantiomeric excess.

Enzyme-mediated preparation of enantioenriched forms of trans- and cis-p-menthan-1,8-dien-5-ol

Fuganti C;Serra S
2006

Abstract

The synthesis of the trans-p-menthan-5-ol (+/-)-1 was carried out by Diels-Alder cycloaddition of 3-keto-1-butenyl-acetate 3 with isoprene followed by Wittig methylenation. PS lipase resolution of the alcohol afforded acetate (-)-5 with 98% ec, which was hydrolysed to give (-)1. Alternatively, enzymatic hydrolysis of a keto ester followed by Wittig methylenation and hydrolysis afforded the same alcohol with an ee of 86%. The cis-p-menthan-5-ol (-)-2 was obtained by Swern oxidation of (-)-1. followed by diastereoselective reduction with L-Selectride without lost of enantiomeric excess.
2006
Istituto di Chimica del Riconoscimento Molecolare - ICRM - Sede Milano
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/167443
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