反应详情

The product of step (a) above (546 mg) was dissolved in dry ether (10 ml) and stirred under a nitrogen atmosphere at -60°. A solution of n-butyl lithium (1.25 ml of 1.6 M) was added dropwise. After stirring for 5 minutes methyl disulphide (179 ml) was added dropwise and the mixture stirred for a further 45 minutes. The mixture was allowed to warm up to room temperature then quenched with water. The layers were separated and the aqueous layer extracted with ethyl acetate. The combined organic solution was washed with water and brine then dried and evaporated to leave the sub-title compound as a gum. MS MW 240 bp 207.

1. additionwas added dropwise
2. stirringthe mixture stirred for a further 45 minutes
3. customthen quenched with water
4. customThe layers were separated
5. extractionthe aqueous layer extracted with ethyl acetate
6. washThe combined organic solution was washed with water and brine
7. customthen dried
8. customevaporated