| Autor: |
Alessandra Bonamore, Irene Rovardi, Francesco Gasparrini, Paola Baiocco, Marco Barba, Carmela Molinaro, Bruno Botta, Alberto Boffi, Alberto Macone |
| Předmět: |
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| Zdroj: |
Green Chemistry; Sep2010, Vol. 12 Issue 9, p1623-1627, 5p |
| Abstrakt: |
An efficient, stereoselective, green synthesis of (S)-norcoclaurine (higenamine) has been developed using the recombinant (S)-norcoclaurine synthase (NCS) enzyme, starting from the cheap tyrosine and dopamine substrates in a one-pot, two step process. Key steps in the biotransformation consist of the oxidative decarboxylation of tyrosine by stoichiometric amounts of sodium hypochlorite in order to generate 4-hydroxyphenylacetadehyde, followed by the addition of enzyme and dopamine substrate in the presence of ascorbate, a necessary ingredient in order to avoid oxidation of the catechol moiety. Quantitative extraction of the product from an aqueous solution was achieved by adsorption onto active charcoal dispersed in the reaction mixture. The optimized process afforded enantiomerically pure (S)-norcoclaurine (93%) in a yield higher than 80% and allowed good recovery of the enzyme for recycling. The process thus developed represents the first example of a green Pictet–Spengler synthesis, which may pave the way to novel strategies in benzylisoquinoline alkaloid synthesis. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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