Regioselective Robinson Annulation Realized by the Combined Use of Lithium Enolates and Aluminum Tris(2,6-diphenylphenoxide) (ATPH)
作者:Susumu Saito、Itsuro Shimada、Yusuke Takamori、Michiaki Tanaka、Keiji Maruoka、Hisashi Yamamoto
DOI:10.1246/bcsj.70.1671
日期:1997.7
enolates derived from ketones to a variety of α,β-unsaturated ketones was realized in the presence of aluminum tris(2,6-diphenylphenoxide) (ATPH). In this reaction, ATPH can be used as a carbonyl protector of α,β-unsaturated carbonyl substrates upon complexation, which facilitates the regioselective 1,4-addition of lithium enolates to Michael acceptors. Similarly, dianions of β-dicarbonyl compounds undergo
在三(2,6-二苯酚)铝(ATPH)存在下,实现了衍生自酮的烯醇锂与各种α,β-不饱和酮的迈克尔加成。在该反应中,ATPH 在络合后可用作 α,β-不饱和羰基底物的羰基保护剂,这促进了烯醇锂与迈克尔受体的区域选择性 1,4-加成。同样,β-二羰基化合物的二价阴离子使用ATPH作为反应的有效促进剂,顺利地进行迈克尔加成。随后的区域选择性、分子内醛醇缩合也被证明,导致双环碳环系统。通常在质子介质中进行的罗宾逊环化很难获得这样的系统。