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Reagents and conditions: (a)162 (1) 3 equiv of R1CHO, TFA, DCM, reflux, 3 h, (2) DCM, rt, hν (white LED), 1 h (12 h for 82.2c), (3) DDQ, DCM, rt, 2 min; (b) (1) 0.33 equiv of dialdehyde, TFA, toluene, reflux, 3 h, (2) DCM, rt, hν (white LED), 12 h, (3) DDQ, DCM, rt, 2 min.
