Anti aldol reactions of an L-erythrulose derivative with several α-chiral aldehydes mediated by dicyclohexylboron chloride are examined. Good yields and stereoselectivities are observed. The results are best explained when the reactions are assumed to occur via boat-like transition states with minimization of 1,3-allylic strain and avoidance of syn pentane interactions.
二环己基
氯化
硼催化的
L-赤藓糖衍
生物与几种α-手性醛的反aldol反应被研究。观察到了高产率和高立体选择性。当假设反应通过船式过渡态进行,最小化1,3-同烯丙基张力并避免syn-
戊烷相互作用时,结果得到最好的解释。