| 摘要 |
The method for preparing brasinoride analogues or formula (I), useful as plant growth regulator, is presented. Thus, 18.0g of p- toluenesulfonyl chloride is added to 200ml of the solution having 15g of stigmasterol. The above mixture solution is reacted at the room temperature for 12 hrs and the reacted solution is added to 1 litre of 5% sodium bicarbonate solution. The obtained precipitates are filtered, washed with water and dried at below 60≦̸C under vaccum. The above solid is re-crystalized to make the white stigmasterol-3- tosilate. In (I), R is H, C1-10 aliphatic gp., cyclo or aromatic gp.
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