8H-Anhydro-4-hydroxy-2-oxo-1,3-thiazinium Hydroxides as Mesoionic 1,4-Dipoles
摘要:
The previously unknown 8H-anhydro-4-hydroxy-2-oxo-1,3-thiazinium hydroxides (1) were prepared and their 1,4-dipolar cycloaddition behavior was examined. In most cases, elimination of the proton in the 8-position of the mesoionic ring was observed to occur unless extremely reactive dipolarophiles were used. The S,N-ketene acetals were converted to the corresponding alpha-diazo ketones for further study.
8H-Anhydro-4-hydroxy-2-oxo-1,3-thiazinium Hydroxides as Mesoionic 1,4-Dipoles
摘要:
The previously unknown 8H-anhydro-4-hydroxy-2-oxo-1,3-thiazinium hydroxides (1) were prepared and their 1,4-dipolar cycloaddition behavior was examined. In most cases, elimination of the proton in the 8-position of the mesoionic ring was observed to occur unless extremely reactive dipolarophiles were used. The S,N-ketene acetals were converted to the corresponding alpha-diazo ketones for further study.
[EN] NOTCH PATHWAY SIGNALING INHIBITOR COMPOUNDS<br/>[FR] COMPOSÉS INHIBITEURS DE LA VOIE DE SIGNALISATION DE NOTCH
申请人:LILLY CO ELI
公开号:WO2017007702A1
公开(公告)日:2017-01-12
The present invention provides the following compounds, or pharmaceutically acceptable salts thereof, and pharmaceutical compositions containing said compounds useful as a Notch pathway signaling inhibitor for the treatment of named cancers, sensorineural hearing loss caused by auditory hair cell loss, and inducing auditory hair cell generation.
Details associated with the bimolecular 1,4-dipolar cycloaddition reaction of cross-conjugated heteroaromatic betaines
作者:Albert Padwa、Steven J. Coats、Mark A. Semones
DOI:10.1016/0040-4020(95)00323-z
日期:1995.6
prepared from the reaction of 3H-thiolactams with 1,3-bielectrophiles. These cross-conjugated heteroaromaticbetaines undergo regio- and diastereospecific 1,4-dipolarcycloaddition with electron-rich and electron-deficient π-bonds to produce 1,4-cycloadducts containing a carbonyl sulfide bridge. A representative betaine dipole and a 1,4-cycloadduct were characterized by single crystal X-ray determinations
The present invention provides the following compounds, or pharmaceutically acceptable salts thereof, and pharmaceutical compositions containing said compounds useful as a Notch pathway signaling inhibitor for the treatment of named cancers, sensorineural hearing loss caused by auditory hair cell loss, and inducing auditory hair cell generation.
Generation of the Dihydro-5H-Thiazolo[3,2-a]pyridin-3-one Ring System by Proton Loss from Isothiomünchnones
作者:Albert Padwa、Zhijia J. Zhang
DOI:10.3987/com-93-s32
日期:——
Dihydro-5H-thiazolo[3,2-a]pyridin-3-ones are easily generated by proton loss from isothiomunchnones. The closely related tetrahydro-2H-pyrido[2,1-b]-[1,3]thiazin-4-one ring system was prepared by treating piperidine-2-thione with acryloyl chloride. These cyclic S,N-ketene acetals undergo smooth reaction with different electrophiles in the presence of Lewis acids.
A short synthesis of (±)-alloyohimbane via a thioisomünchnone based intramolecular dipolar-cycloaddition reaction
作者:Todd M. Heidelbaugh、Bing Liu、Albert Padwa
DOI:10.1016/s0040-4039(98)00901-0
日期:1998.7
Thioisomunchnone dipoles were generated by the reaction of bromoalkenoyl chlorides with thioamides. The intramolecular dipolar-cycloaddition reaction was used for a short synthesis of the yohimbanoid alkaloid (+/-)-alloyohimbane. (C) 1998 Elsevier Science Ltd. All rights reserved.