Synthesis of allenic diols by samarium diiodide-promoted coupling between alkynyloxiranes and ketones
作者:JoséM. Aurrecoechea、Eva Alonso、Mónica Solay
DOI:10.1016/s0040-4020(98)00110-0
日期:1998.4
The SmI2-mediated reductive coupling between alkynyloxiranes and ketones provides a new route to 2,3-pentadiene-1,5-diols. The preferred stereochemistry observed in the coupling products is the result of the new CC bond forming anti with respect to the opening epoxide ring. Yields and diastereoselectivities are dependent on the alkynyloxirane substitution pattern.
High chemo- and enantioselectivity have been obtained for asymmetricepoxidation of conjugated enynes using a fructose-derived chiral ketone as catalyst and Oxone as oxidant.
Stereoselective samarium diiodide-promoted intermolecular coupling of alkynyloxiranes with ketones. synthesis of 2,3-pentadiene-1,5-diols
作者:JoséM. Aurrecoechea、Mónica Solay
DOI:10.1016/0040-4039(95)00254-a
日期:1995.4
In the presence of samarium diiodide (SmI2), alkynyloxiranes undergo an efficient reductive coupling with ketones to afford 2,3-pentadiene-1,5-diols. The isolated yields are high and the stereoselectivity of the process ranges from moderate to very high. The stereochemistry of the major product of the reaction is the result of the new CC bond forming anti with respect to the opening epoxide ring.