of allylic syn 1,3-diols is developed. An intramolecular oxa-Michael reaction onto vinyl heteroaromatic sulfones allows the diastereoselective formation of 1-sulfonyl 2,4-diols protected as benzylidene acetals. These sulfones are then engaged in a modified Julia olefination to furnish the olefins contiguous to the benzylidene acetal ring with good E/Z selectivity.
                                    开发了两步合成烯丙基顺式1,3
-二醇的方法。在
乙烯基杂芳族砜上的分子内氧杂-迈克尔反应允许非对映选择性地形成被保护为亚苄基
乙缩醛的1-磺酰基2,4
-二醇。然后将这些砜进行改性的Julia烯化反应,以良好的E / Z选择性提供与亚苄基
乙缩醛环相邻的烯烃。