Synthesis of macrocyclic α-amino esters through the chemoselective hydrolysis of benzoxazinephanes
摘要:
New meso-macrocyclic a-amino esters were synthesized through the chemoselective hydrolysis of azacyclophanes derived from L.-tyrosine (benzoxazinephanes). The results showed that the alkyl chain of the ester determined the chemoselectivity of the reaction. (C) 2012 Elsevier Ltd. All rights reserved.
New meso-macrocyclic a-amino esters were synthesized through the chemoselective hydrolysis of azacyclophanes derived from L.-tyrosine (benzoxazinephanes). The results showed that the alkyl chain of the ester determined the chemoselectivity of the reaction. (C) 2012 Elsevier Ltd. All rights reserved.
Hydrogen bond assisted synthesis of azacyclophanes from l-tyrosine derivatives
units of l-tyrosine derivatives, joined by intermolecular hydrogen bonds, acts as a template in the synthesis of azacyclophanes froml-tyrosine derivatives and formaldehyde via double Mannich type reaction. When the reaction is performed with l-tyrosine, the absence of this template leads to linear products. A new azacyclophane (benzoxazinephane) was synthesized by condensation of l-tyrosine isopropyl