In a microwave tube, [Rh(nbd)2]BF4 (2.5 mol%) and (1R,1'R,2S,2'S)-DuanPhos (3.5 mol%) were dissolved in DCM (1 ml) under a nitrogen atmosphere and stirred for 20 min. Subsequently a solution of alkenyl aniline a13 (1 eq) in a minimal amount of DCM was added. Subsequently MeOH (ratio MeOH/DCM: >7/1, 0.2 M) was added. The microwave tube was transferred into the autoclave and the reactor was purged three times with H2. The reactor was pressurized to 50 bar H2 and the mixture was stirred at ambient temperature for 48h. The reaction mixture was concentrated and purified by silica gel column (DCM:pentane, 1:4). Chiral aniline a12 was obtained in 90% yield as colourless oil. To a solution of 2,3-butanedione (1.00 equiv.) in toluene (0.20 M) were added aniline (2.10 equiv.) and p-toluenesulfonic acid monohydrate (5.00 mol%). The mixture was heated to 80 o C overnight, then refluxed for 48 hours (monitoring by TLC), then concentrated under reduced pressure to afford mixture of products. The mixture was washed with MeOH, obtaining the crude bisimine as a yellow solid after drying under vacuum. The crude bisimine can be directly submitted to next step without any purification.