The stereochemistry of the intramolecular electrophilic attack of an aldehyde on a carbon-tin bond
作者:Ian Fleming、Michael Rowley
DOI:10.1016/s0040-4020(01)87383-x
日期:1986.1
The cyclopentane-forming reaction (20–43) of (4),5)-2, 2,4-trimethyl-5-trimethylstannylhexanal takes place with retention of configuration at the carbon atom undergoing electrophilicsubstitution, in contrast to similar cyclopropane-forming reactions (e.g. 47–48), which take place with inversion of configuration. The hydride transfer (24–45) of the 4,5 diastereoisomeric hexanal takes place from a conformation
(4 ),5 )-2,2,4-三甲基-5-三甲基锡烷基己醛的环戊烷形成反应(20–43)与亲电取代的碳原子形成相反,发生了亲电取代的碳原子上保留了构型反应(例如47–48),这是随着配置反转而发生的。4,5非对映异构己醛的氢化物转移(24-45)是从氢化物构象到苯乙烯基的。对于可能形成四元环的反应,会发生断裂(16–28和17–30)。带有苯乙烯基的碳上存在苯环会干扰旨在测试S E 2反应的立体化学的反应,从而使该反应转向形成四氢化萘(10-26和34-38)或苯环庚烯(34 –37)。
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.
作者:Mallinath B. Hadimani、Rajeswari Mukherjee、Ranjan Banerjee、Mai E. Shoman、Omar M. Aly、S. Bruce King
DOI:10.1016/j.tetlet.2015.09.002
日期:2015.10
basic hydrolysis yields the ring expansion product cyclichydroxamicacids in 12–81% yield. Reactions of substituted cyclopentanones provide ring expanded products where the –NOH group regioselectively inserts to the more substituted position and gives a better yield compared to the treatment of the same ketone with a basic solution of Piloty’s acid. Reaction of phosphines with acyloxy nitroso compounds
Lactam Compound, Preparation Method and Use thereof
申请人:OCEAN UNIVERSITY OF CHINA
公开号:US20200030312A1
公开(公告)日:2020-01-30
Provided is a lactam compound, a tautomer, a stereoisomer, a racemate, a nonequal mixture of enantiomers, a geometric isomer, a solvate, a pharmaceutically acceptable salt thereof, or a solvate of the salt of the compound, and a pharmaceutical composition containing the compound. Also provided are the use of such compounds and their pharmaceutical compositions as drugs, especially as antiviral drugs.
Perfumery compositions with trimethyl-tetrahydropyran-2-ones
申请人:Henkel Kommanditgesellschaft auf Aktien
公开号:US04212773A1
公开(公告)日:1980-07-15
A perfumery composition consisting essentially of from 1% to 50% by weight of a trimethyl-tetrahydropyran-2-one selected from the group consisting of (1) 4,6,6-trimethyl-tetrahydropyran-2-one of the formula ##STR1## (2) 4,4,6-trimethyl-tetrahydropyran-2-one of the formula ##STR2## and (3) mixtures of (1) and (2), and the remainder customary constituents of perfumery compositions; as well as the method of imparting a pleasing odor utilizing said trimethyl-tetrahydropyran-2-ones.