Enantioselective Halolactonization Reactions using BINOL-Derived Bifunctional Catalysts: Methodology, Diversification, and Applications
作者:Daniel W. Klosowski、J. Caleb Hethcox、Daniel H. Paull、Chao Fang、James R. Donald、Christopher R. Shugrue、Andrew D. Pansick、Stephen F. Martin
DOI:10.1021/acs.joc.8b00490
日期:2018.6.1
A general protocol is described for inducing enantioselective halolactonizations of unsaturated carboxylic acidsusing novel bifunctional organic catalysts derived from a chiral binaphthalene scaffold. Bromo- and iodolactonization reactions of diversely substituted, unsaturated carboxylic acids proceed with high degrees of enantioselectivity, regioselectivity, and diastereoselectivity. Notably, these
Enantioselective Iodolactonization of Disubstituted Olefinic Acids Using a Bifunctional Catalyst
作者:Chao Fang、Daniel H. Paull、J. Caleb Hethcox、Christopher R. Shugrue、Stephen F. Martin
DOI:10.1021/ol3030555
日期:2012.12.21
The enantioselectiveiodolactonizations of a series of diversely substituted olefinic carboxylic acids are promoted by a BINOL-derived, bifunctional catalyst. Reactions involving 5-alkyl- and 5-aryl-4(Z)-pentenoic acids and 6-alkyl- and 6-aryl-5(Z)-hexenoic acids provide the corresponding γ- and δ-lactones having stereogenic C–I bonds in excellent yields and >97:3 er. Significantly, this represents
BINOL 衍生的双功能催化剂促进了一系列不同取代的烯烃羧酸的对映选择性碘内酯化。涉及 5-烷基-和 5-芳基-4( Z )-戊烯酸和 6-烷基-和 6-芳基-5( Z )-己烯酸的反应提供相应的具有立体异构 C-I 键的 γ-和 δ-内酯以优异的产量和 >97:3 er。值得注意的是,这代表了第一种以高对映选择性促进溴和碘内酯化的有机催化剂。还证明了该催化剂诱导外消旋不饱和酸的动力学拆分的潜力。
Capsaicinoids: their separation, synthesis, and mutagenicity
作者:Peter M. Gannett、Donald L. Nagel、Pam J. Reilly、Terence Lawson、Jody Sharpe、Bela Toth
DOI:10.1021/jo00240a024
日期:1988.3
Visible-Light-Promoted Xanthate-Transfer Cyclization Reactions of Unactivated Olefins under Photocatalyst- and Additive-Free Conditions