3-Disubstituted 2-hydroxyalkylthiophenes 9 and 10 were synthesized in a five-step sequence and their diastereoselective complexation with the Cr(CO)3 fragment leading to the corresponding tricarbonyl(thiophene)chromium complexes 11 and 12 was investigated. The diastereoselectivity achieved in the complexation reaction was up to 85% d. e. and depends primarily on the bulkiness of the substituent in the 3-position
以五步顺序合成2,3-二取代的2-羟基烷基
噻吩9和10,并研究了它们与Cr(CO)3片段的非对映选择性络合形成相应的三羰基(
噻吩)
铬络合物11和12。在络合反应中获得的非对映选择性高达85%de,主要取决于
噻吩3-位取代基的体积。配合物11a的立体异构中心和手性平面元素的相对构型通过X射线衍射分析确定。