Reaction of 5-aryloxazolidines with arylmagnesium bromides as a new route to N-benzyl-β-hydroxyphenethylamines as starting materials for the preparation of 4-aryl-1,2,3,4-tetrahydroisoquinolines
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tetlet.2013.03.076
日期:2013.5
Benzaldehydes react smoothly with the non-stabilized azomethineylide derived from sarcosine and formaldehyde to form 5-aryloxazolidines as intermediates, which undergo ring-opening to give N-benzyl-β-hydroxyphenethylamines in good yields by the action of arylmagnesium bromides. Their subsequent acid-catalyzed cyclization into 4-aryl-1,2,3,4-tetrahydroisoquinolines was performed in moderate to good
A one-pot synthesis of tetrahydroisoquinolin-4-ols via a novel acid-catalyzed rearrangement of 5-aryloxazolidines
作者:Vladimir S. Moshkin、Vyacheslav Ya. Sosnovskikh
DOI:10.1016/j.tetlet.2013.02.087
日期:2013.5
nonstabilized azomethine ylidederivedfrom sarcosine and formaldehyde to form 5-aryloxazolidines as intermediates, which undergo rearrangement into 2-methyl-1,2,3,4-tetrahydroisoquinolin-4-ols in high yields by simple heating with hydrochloric acid. This one-pot synthesis of tetrahydroisoquinolines can be considered as a formal [3+3] cycloaddition of the azomethine ylide to the aromatic aldehyde.
A one-pot synthesis of 4-aryl-2-methyl-1,2,3,4-tetrahydro-γ-carbolines from 5-aryloxazolidines and indoles via a Mannich/Friedel–Crafts sequence
作者:Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1016/j.tetlet.2014.09.058
日期:2014.10
Benzaldehydes react smoothly with the nonstabilized azomethineylide derived from sarcosine and formaldehyde to form 5-aryloxazolidines, which undergo ring-opening to give 2-(indol-3-ylmethylamino)-1-arylethanols in 69–79% yields on reaction with indoles in acetic acid. Their subsequent acid-catalyzed cyclization into 4-aryl-2-methyl-1,2,3,4-tetrahydro-γ-carbolines was performed in polyphosphoric acid
Tunable Approach to Diverse Phenethylamines via Reduction of 5-Aryloxazolidines with Triethylsilane
作者:Anastasia A. Smorodina、Evgeny M. Buev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1021/acs.joc.3c02264
日期:2024.2.16
trifluoroacetic acid yields three types of products: N,N-dimethylphenylethanolamines, N,N-dimethylphenethylamines, and tetrahydroisoquinolines, depending on the substituents in the aromatic ring and reaction conditions. Moreover, an additional step of oxazolidine hydrolysis or ring-opening with hydrogen cyanide allowed us to synthesize N-methyl- or N-methyl-N-(cyanomethyl)phenethylamines.
开发了一种从芳香醛快速合成各种β-苯乙胺的途径。最初,通过肌氨酸和多聚甲醛衍生的N-甲基偶氮甲碱叶立德的 [3 + 2] 环加成反应制备了多种 5-芳基恶唑烷。随后在三氟乙酸中用三乙基硅烷还原 5-芳基恶唑烷,产生三种类型的产物: N , N-二甲基苯基乙醇胺、 N , N-二甲基苯乙胺和四氢异喹啉,具体取决于芳环中的取代基和反应条件。此外,恶唑烷水解或用氰化氢开环的额外步骤使我们能够合成N-甲基-或N-甲基-N- (氰基甲基)苯乙胺。