Highly Diastereoselective Esterification of Ketenes Generated In Situ from Acyl Chlorides with (<i>R</i>)-Pantolactone Derivatives
作者:Takafumi Yamagami、Masanori Hatsuda、Masayuki Utsugi、Ryo Kobayashi、Yasunori Moritani
DOI:10.1002/ejoc.201301383
日期:2013.11
revealed that Et3N is a key requirement for the highly diastereoselective formation of esters from the corresponding acyl chlorides with (R)-pantolactone via ketene-derived complexes. Furthermore, we have discovered that (R)-N-benzyl-pantolactam is a more effective chiral alcohol than (R)-pantolactone for the esterification of in situ generated ketenes.
我们的机理研究表明,Et3N 是通过乙烯酮衍生的复合物从相应的酰氯与 (R)-泛内酯形成高度非对映选择性形成酯的关键要求。此外,我们发现 (R)-N-苄基-泛内酰胺是比 (R)-泛内酯更有效的手性醇,用于原位生成的烯酮的酯化。