Anionic cyclizations of aromatic ester dithioacetals with facially biased α,β-unsaturated ketones
作者:Christopher F. Morrison、Craig T.M. Stamp、D. Jean Burnell
DOI:10.1016/j.tetlet.2009.09.162
日期:2009.12
reacted efficiently with anions derived from aromatic ester dithioacetals to provide annulated products in a highly diastereoselective fashion. Whereas the anion of a dimethoxy aromatic ester dithiolane more rapidly reacted by an alternative intramolecular pathway, the anion of the corresponding aromatic ester dithiane was suitable for the intermolecular cyclization.
在C-4上具有平面不对称氧官能团的环戊2-烯酮与衍生自芳族酯二硫缩醛的阴离子有效反应,以高度非对映选择性的方式提供环化产物。尽管二甲氧基芳族酯二硫杂环戊烷的阴离子通过另一种分子内途径更快速地反应,但相应的芳族酯二硫杂环戊烷的阴离子适合分子间环化。