Efficient syntheses of 2-(2,6-dichloro-4-trifluoromethyl-phenyl)tetrahydrocyclopenta, tetrahydrothiopyrano, hexahydrocycloheptapyrazoles and tetrahydroindazoles
作者:Sanath K. Meegalla、Dario Doller、Ruiping Liu、Deyou Sha、Richard M. Soll、Dale S. Dhanoa
DOI:10.1016/s0040-4039(02)02158-5
日期:2002.11
Two methods are described for the regiospecificsynthesis of 3,4-fused-cycloalkyl-1-arylpyrazoles; the key step is the reactionbetween aryl hydrazines and cyclic α-(dimethoxymethyl)ketones. The latter are obtained by BF3-promoted alkylation of ketones with trimethylorthoformate.
[EN] DIHYDROPYRIMIDINE DERIVATIVES AND USES THEREOF IN THE TREATMENT OF HBV INFECTION OR OF HBV-INDUCED DISEASES<br/>[FR] DÉRIVÉS DE DIHYDROPYRIMIDINE ET LEURS UTILISATIONS DANS LE TRAITEMENT D'UNE INFECTION PAR LE VIRUS DE L'HÉPATITE B OU DE MALADIES INDUITES PAR LE VIRUS DE L'HÉPATITE B
申请人:JANSSEN SCIENCES IRELAND UNLIMITED CO
公开号:WO2019214610A1
公开(公告)日:2019-11-14
Provided herein are dihydropyrimidine derivatives which are useful in the treatment of HBV infection or HBV-induced diseases, as well as pharmaceutical or medical applications thereof.
IMMOBILIZED CATALYST DIRECTED TO SYNTHETIC CONTROL. CROSS-ALDOL REACTION
作者:Teruaki Mukaiyama、Hiroshi Iwakiri
DOI:10.1246/cl.1985.1363
日期:1985.9.5
Cross-aldol adducts are stereoselectively formed in good yields by treating acetals or aldehydes and silyl enol ethers in a heterogeneous system with a catalytic amount of polymer-supported trityl perchlorate.
In the presence of a catalytic amount of tritylperchlorate, silyl enol ethers and ketene silyl acetals react with acetals and methyl orthoformate to give the corresponding aldol-type addition products in good yields.
Trimethysilyl triflate in organic synthesis11Part 11 of this series. Part 10: S. Murata and R. Noyori, Tetrahedron Letters 2107 (1981).
作者:R. Noyori、S. Murata、M. Suzuki
DOI:10.1016/s0040-4020(01)93263-6
日期:——
Trimethylsilyl triflate is a powerful silylating agent for organic compounds and acts as a catalyst which accelerates a variety of nucleophilic reactions in aprotic media. The reactions proceed via one-center, electrophilic coordination of the silyl group to hetero functional groups and exhibit unique selectivities.