Compounds of formula I:
1
are useful in treating diseases prevented by or ameliorated with potassium channel openers. Also disclosed are potassium channel opening compositions and a method of opening potassium channels in a mammal.
Amide Bond Formation via the Rearrangement of Nitrile Imines Derived from <i>N</i>-2-Nitrophenyl Hydrazonyl Bromides
作者:Mhairi Boyle、Keith Livingstone、Martyn C. Henry、Jessica M. L. Elwood、J. Daniel Lopez-Fernandez、Craig Jamieson
DOI:10.1021/acs.orglett.1c03993
日期:2022.1.14
rearrangement of highly reactive nitrile imines derived from N-2-nitrophenyl hydrazonyl bromides can be harnessed for the facile construction of amide bonds. This amidation reaction was found to be widely applicable to the synthesis of primary, secondary, and tertiaryamides and was used as the key step in the synthesis of the lipid-lowering agent bezafibrate. The orthogonality and functional group tolerance
Asymmetric construction of dihydrobenzofuran-2,5-dione derivatives <i>via</i> desymmetrization of <i>p</i>-quinols with azlactones
作者:Lihua Xie、Shunxi Dong、Qian Zhang、Xiaoming Feng、Xiaohua Liu
DOI:10.1039/c8cc08985j
日期:——
3-Amino-benzofuran-2,5-diones containing a chiral amino acid residue were achieved through BG-1·HBPh4 catalyzed enantioselective Michael addition/lactonization cascade reaction of p-quinols with azlactones.
Organocatalyzed Asymmetric 1,4-Addition of Azlactones to α,β-Unsaturated Trichloromethyl Ketones: Synthesis of α,α-Disubstituted α-Amino Acid Derivatives
作者:Jinlong Zhang、Xihong Liu、Chongyang Wu、Panpan Zhang、Jianbo Chen、Rui Wang
DOI:10.1002/ejoc.201403158
日期:2014.11
4-addition of azlactones to α,β-unsaturated trichloromethyl ketonescatalyzed by cinchonaalkaloid derived bifunctional thiourea catalysts was developed. A series of α,α-disubstituted α-amino acid derivatives bearing a quaternary stereocenter at the α-position were obtained in high yields with excellent diastereo- and enantioselectivities (up to -20:1 dr and 99% ee). In addition, the trichloromethyl moiety
A novel concept that conversion of chiral 2-substituted DMAP into its DMAP-N-oxide could significantly enhance the catalytic activity and still be used as an acyltransfercatalyst is presented. A new type of chiral 2-substituted DMAP-N-oxides, derived from l-prolinamides, has been rationally designed, facilely synthesized, and applied in the dynamic kinetic resolution of azlactones. Using simple MeOH