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In an analogous manner to compound 47, 4-hydroxy benzaldehyde (1 eq) and ethyl 2-bromoacetate (1.1 eq) were reacted to produce the desired product (52%) as a brown oil. NMR: δ 1.306 (t, J=6.8 Hz, 3H), 4.29 (q, J=7.2 Hz, 2H), 4.710 (s, 2H), 7.016 (d, J=8.8 Hz, 2H), 7.85 (d, J=8.8 Hz, 2H), 9.904 (s, 1H).