已经实现了倍半萜烃月桂烯的全合成,包括酮甲基化的非表观异构化方法。结果表明,Corey和Kwiatkowski的膦酸双(二甲酰胺)法和Kuwajima的亚磷酸酯热解法均未发生表观不对称。然而,对于目前的情况,最近发表的Coates方法[ J. Am。化学 Soc。94,4758(1972)]是优选的。
已经实现了倍半萜烃月桂烯的全合成,包括酮甲基化的非表观异构化方法。结果表明,Corey和Kwiatkowski的膦酸双(二甲酰胺)法和Kuwajima的亚磷酸酯热解法均未发生表观不对称。然而,对于目前的情况,最近发表的Coates方法[ J. Am。化学 Soc。94,4758(1972)]是优选的。
Thianthrenation-Enabled α-Arylation of Carbonyl Compounds with Arenes
作者:Xiao-Xue Nie、Yu-Hao Huang、Peng Wang
DOI:10.1021/acs.orglett.0c02913
日期:2020.10.2
The Pd-catalyzed α-arylation of carbonylcompounds with simple arenes enabled by site-selective thianthrenation has been demonstrated. This one-pot process using thianthrenium salts as the traceless arylating reagents features mild conditions and a broad substrate scope. In addition, this protocol could also tolerate the heterocyclic carbonylcompounds and complex bioactive molecules, which is appealing
Direct geminal dimethylation of ketones using dimethyltitanium dichloride
作者:Manfred T. Reetz、J�rgen Westermann、Rainer Steinbach
DOI:10.1039/c39810000237
日期:——
Ketones are readily converted into the corresponding geminal dimethyl derivatives on reaction with dimethyltitaniumdichloride under mild conditions; tertiary alcohols react similarly.
A kineticresolution of racemic 2-substituted cyclopentanones via highly regio- and enantioselective Baeyer–Villiger oxidation has been successfully developed. The reaction could afford the normal 6-substituted δ-lactones in up to 98% ee and >19/1 regioselectivity. Meanwhile, the unreacted ketones were recovered in excellent ee values (up to 98%). It represents the best results of the kinetic resolution
Organocatalytic asymmetric Michael addition of α-aryl cyclopentanones to nitroolefins for construction of adjacent quaternary and tertiary stereocenters
作者:Xiu-Qin Dong、Huai-Long Teng、Min-Chao Tong、He Huang、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1039/c0cc01987a
日期:——
The first asymmetric Michael addition of alpha-aryl cyclopentanones to nitroolefins for construction of adjacentquaternary and tertiarystereocenters has been achieved with excellent diastereo-/enantioselectivity.