Stereochemical and spectroscopic studies on the reaction of allylstannanes with aldehydes
作者:Scott E. Denmark、Eric J. Weber、Thomas M. Wilson、Timothy M. Willson
DOI:10.1016/0040-4020(89)80016-x
日期:1989.1
for the reacting double bonds in the Lewis acid-induced reaction of allylic stannanes and aldehydes has been examined. Model system 1 shows a strong and Lewis-acid independent preference for the synclinal orientation of double bonds. A possible stereoelectronic basis for this preference is discussed. A13C-NMR spcctroscopic study of the reaction between crotyltrialkylstannanes (9) and acetaldehyde (10)
已经检查了路易斯酸诱导的烯丙基锡烷和醛的反应中反应双键的取向偏好。模型系统1对双键的向斜取向表现出强烈的和路易斯酸依赖性的偏爱。讨论了这种偏好的可能的立体电子基础。描述了在BF 3 ·OEt 2和SnCl 4存在下,巴豆基三烷基锡烷(9)与乙醛(10),苯甲醛(11)和4-叔丁基苯甲醛(12)之间反应的13 C-NMR质谱研究。光谱研究表明,对于BF 3 ·OEt 2,仅直接添加发生,而对于SnCl 4途径(加成与易位)是化学计量比和醛依赖性的。讨论了复分解和氯锡烷异构化的机理。