A Scalable and Regioselective Synthesis of 2-Difluoromethyl Pyridines from Commodity Chemicals
作者:Jean-Nicolas Desrosiers、Christopher B. Kelly、Daniel R. Fandrick、Larry Nummy、Scot J. Campbell、Xudong Wei、Max Sarvestani、Heewon Lee、Alexander Sienkiewicz、Sanjit Sanyal、Xingzhong Zeng、Nelu Grinberg、Shengli Ma、Jinhua J. Song、Chris H. Senanayake
DOI:10.1021/ol500402e
日期:2014.3.21
novo synthesis of difluoromethyl pyridines from inexpensive materials is reported. The pyridyl subunit is built around the difluoromethyl group rather than a late stage introduction of this moiety. This user-friendly approach allows access to a diverse range of substitution patterns on all positions on the ringsystem and on the difluoromethyl group.
Zur Kenntnis der Phenol-Synthese aus β-Dicarbonyl-Verbindungen und Ketonen
作者:V. Prelog、J. Würsch、K. Königsbacher
DOI:10.1002/hlca.19510340128
日期:——
An einigen Beispielen wurden die Anwendungsgrenzen der Reaktion zwischen β-Dicarboxyl-Verbindungen und den Ketonen mit zwei α-ständigen Methylen-Gruppen, welche zu Phenol-Derivaten führt, untersucht.
贝因斯菲伦的本能论与β-二羧基-Verbindungen和Ketenen mit zweiα-ständigenMethylen-Gruppen的关系,等等。
Asymmetric Domino Heck Arylation and Alkylation of Nonconjugated Dienes: Double C–F···Sodium Attractive Noncovalent Interaction
作者:Daoyong Zhu、Wenqiang Xu、Maoping Pu、Yun-Dong Wu、Yonggui Robin Chi、Jianrong Steve Zhou
DOI:10.1021/acs.orglett.1c02457
日期:2021.9.17
Palladium catalyzes a domino Heckarylation and alkylation of nonconjugated cyclodienes to produce trans isomers of disubstituted cyclohexenes in exceptionally high enantiomeric ratios, reaching 100:1 to 200:1 in many cases. Importantly, the interactions of the two CF bonds of Josiphos and the sodium ion of malonates facilitates stereoselective allylic attack through DFT calculations and experiments