Highly stereoselective synthesis of non-racemic 3-substituted dihydro-benzo[de]isoquinolinones via an addition-cyclization-substitution method
作者:Dorota Kaczorek、Robert Kawęcki
DOI:10.1016/j.tetlet.2020.152034
日期:2020.6
Substituted dihydrobenzo[de]isoquinolinones were synthesized via diastereoselective addition of Grignard reagents to the N-tert-butylsulfinylimine derived from 1,8-naphthaldehydic methyl ester, followed by cyclization and substitution at the sulfur atom. The products were obtained in 25–98% yield and with enantiomeric excess of 46–99%.
取代的二氢苯并[ de ]异喹啉酮是通过将格氏试剂非对映选择性地加成到衍生自1,8-萘二甲酸甲酯的N-叔丁基亚磺酰亚胺中,然后环化并在硫原子上取代而合成的。获得的产物产率为25-98%,对映体过量为46-99%。
Renin inhibitors
申请人:American Home Products Corporation
公开号:US05023338A1
公开(公告)日:1991-06-11
A compound of the formula: ##STR1## wherein A is ##STR2## in which X is .dbd.CH-- or .dbd.N--; R.sup.2 is hydrogen, alky, phenyl, benzyl or phenethyl; Y is --CH.sub.2 --, --NH-- or --O--; and Z is --H.sub.2 or .dbd.O; B is His, Leu, Ile, Nva, Nle, Ala or Val; and R.sup.1 is hydrogen, alkyl, phenyl or phenylalkyl; or a pharmaceutically acceptable salt thereof are renin inhibitors.
Arynes were found to couple with aminosilanes and carbonylcompounds in the presence of benzoic acid to provide 2-aminobenzhydrols. Sulfonylimines could also be applied to the reaction, enabling amino and aminomethyl moieties to be incorporated into contiguous positions of aromatic skeletons. Only a small amount of the three-component coupling product was obtained in the absence of benzoic acid, which
Synthesis of (alkylaminomethyl)lactones and hydroxypiperidones using alkylaminomethylation methodology
作者:Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2015.10.024
日期:2015.11
compounds bearing CO2R or CN groups with nonstabilized azomethineylides. Oxazolidine–lactone rearrangement of the intermediate adducts was carried out for the first time to give (aminomethyl)lactones in good yields. The latter could be rearranged to give 5-hydroxy-2-piperidones, which could also be directly obtained from the aromatic ketones thus avoiding isolation of the intermediate lactone.
Formal transfers of hydride from carbon–hydrogen bonds. Attempted generation of H<sub>2</sub> by intramolecular protonolyses of the activated carbon–hydrogen bonds of dihydrobenzimidazoles
作者:Philippe Brunet、James D. Wuest
DOI:10.1139/v96-074
日期:1996.5.1
Protonolyses of carbon–hydrogenbonds can occur under suitable conditions to produce carbocations and H2. In an effort to accelerate these fundamental reactions, we have attempted to make them intramolecular by devising compounds in which carbon–hydrogenbonds designed to be particularly good formal donors of hydride are held in close proximity to acidic sites. Dihydrobenzimidazoles 4 and 11 are compounds