[NH2:1]/[C:2](/[C:6]([CH3:9])([CH3:8])[CH3:7])=[CH:3]\[C:4]#[N:5].O.O.O.O.O.O.O.O.O.O.[S-2:20].[Na+].[Na+].C(OCC)(=O)C>[Cl-].C([N+](CCCC)(CCCC)CCCC)CCC.C1C=CC=CC=1.O>[NH2:1]/[C:2](/[C:6]([CH3:9])([CH3:8])[CH3:7])=[CH:3]\[C:4](=[S:20])[NH2:5](Z)-3-amino-4,4-dimethyl-pent-2-enenitrile (26 g, 209.35 mmol), sodium sulfide decahydrate (5.71 g, 73.27 mmol) and tetrabutyl ammonium chloride (9.31 g, 33.49 mmol) in benzene and water (215 mL, 2.5:1, v/v) is stirred at 75° C. under hydrogen sulfide gas for three days. 200 mL of ethyl acetate is added and the layers separated. The organic layer is washed with water, dried over sodium sulfate, filtered and concentrated under reduced pressure to afford the title compound. Yield 23% over three steps. ESI m/z 159=MH+
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