Scheme 20.
Synthesis of new derivatives of 84. Reagents: (a) benzyl bromide, K2CO3; (b) SeO2; (c) NaClO2, NaH2PO4; (d) (i) SOCl2; (ii) 3-(cyclopentyloxy)-4-methoxyaniline or 3,4-dimethoxyaniline, TEA; (e) H2, Pd/C.
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