6-O-Carbamate-11,12-lacto-ketolide antimicrobials of the formula:
1
wherein R
1
, R
2
, R
3
R
7
, and R
8
are as described herein and in which the substituents have the meaning indicated in the description. These compounds are useful as antibacterial agents.
Sonogashira Reaction of Aryl and Heteroaryl Halides with Terminal Alkynes Catalyzed by a Highly Efficient and Recyclable Nanosized MCM-41 Anchored Palladium Bipyridyl Complex
A heterogeneous catalyst, nanosized MCM-41-Pd, was used to catalyze the Sonogashira coupling of aryl and heteroaryl halides with terminal alkynes in the presence of CuI and triphenylphosphine. The coupling products were obtained in high yields using low Pd loadings to 0.01 mol%, and the nanosized MCM-41-Pd catalyst was recovered by centrifugation of the reaction solution and re-used in further runs without significant loss of reactivity.
AROYL-PIPERAZINE DERIVATIVES, THEIR PREPARATION AND THEIR USE AS TACHYKININ ANTAGONISTS
申请人:——
公开号:US20030114668A1
公开(公告)日:2003-06-19
This invention relates to piperazine derivatives of formula (I), wherein Y is bond or lower alkylene, R1 is aryl which may have substituent(s), R2 is aryl or indolyl, each of which may have substituent(s), R3 is hydrogen or lower alkyl, and R4 is as defined in the description, and its pharmaceutically acceptable salt, to processes for preparation thereof, to pharmaceutical composition comprising the same, and to a use of the same for treating or preventing Tachykinin-mediated diseases in human beings or animals.
1
A transition-metal-free, facile and efficient method for the synthesis of 3-alkynylpyrrole-2,4-dicarboxylates from methylene isocyanides and propiolaldehyde with moderate to good yields has been developed. The direct transformation process and good tolerance of various substituents make it an alternative approach to previous protocols, and potential applications of these investigated compounds are
Atom-Economical Cross-Coupling of Internal and Terminal Alkynes to Access 1,3-Enynes
作者:Mingyu Liu、Tianhua Tang、Omar Apolinar、Rei Matsuura、Carl A. Busacca、Bo Qu、Daniel R. Fandrick、Olga V. Zatolochnaya、Chris H. Senanayake、Jinhua J. Song、Keary M. Engle
DOI:10.1021/jacs.0c12565
日期:2021.3.17
synthesizing 1,3-enynes without prefunctionalized building blocks. In this transformation several classes of unactivated internal acceptor alkynes can be coupled with terminal donor alkynes to deliver 1,3-enynes in a highly regio- and stereoselective manner. The scope of compatible acceptor alkynes includes propargyl alcohols, (homo)propargyl amine derivatives, and (homo)propargyl carboxamides. This method is