A convenient synthesis of chiral 2-alkynyl-1,3-oxazolines
摘要:
A general, high-yielding, two-step synthesis of chiral 2-alkynyl-1,3-oxazolines starting from 2-alkynoic acids and 2-aminoalcohols is disclosed. (C) 2000 Published by Elsevier Science Ltd.
A convenient synthesis of chiral 2-alkynyl-1,3-oxazolines
摘要:
A general, high-yielding, two-step synthesis of chiral 2-alkynyl-1,3-oxazolines starting from 2-alkynoic acids and 2-aminoalcohols is disclosed. (C) 2000 Published by Elsevier Science Ltd.
Efficient Synthesis of the 3-Benzazepine Framework via Intramolecular Heck Reductive Cyclization
作者:Pavel A. Donets、Erik V. Van der Eycken
DOI:10.1021/ol071079g
日期:2007.8.1
A microwave-assisted protocol based on reductive Heck reaction was developed for regio- and stereoselective construction of the 3-benzazepine core.
开发了基于还原性Heck反应的微波辅助方案,用于3-苯并ze庚因核心的区域和立体选择性构建。
Synthesis of 2-(2-Thienyl)benzimidazoles by the Reaction of 2-(Mercaptomethyl)benzimidazole With β-Electrophilic Esters
作者:Tamás Kálai、Péter Sáska、Zoltán Szabó、József Jek[otilde]、Olga H. Hankovszky、Kálmán Hideg
DOI:10.1080/00397919708006808
日期:1997.6
Abstract New 2-(2-di- and tetrahydrothienyl)benzimidazole compounds were prepared by the ring closure reactions of 2-(mercaptomethyl)benzimidazole1,2 (1) and α,β-unsaturated compounds activated with electron-withdrawing groups.
Efficient Synthesis of the Indoloazocine Framework via Intramolecular Alkyne Carbocyclization
作者:Pavel A. Donets、Kristof Van Hecke、Luc Van Meervelt、Erik V. Van der Eycken
DOI:10.1021/ol901356h
日期:2009.8.20
A microwave-assisted protocol based on an Hg(OTf)(2) catalyzed intramolecular alkyne carbocyclization reaction was developed for selective construction of the indoloazocine core.
Ranging Correlated Motion (1.5 nm) of Two Coaxially Arranged Rotors Mediated by Helix Inversion of a Supramolecular Transmitter
For a long-range transmission of motion between two movable parts apart from each other, transmitters that can precisely correlate these two motions should be properly incorporated into the system. However, such a motional relay is yet to be realized in artificial systems because of the lack of reliable methodologies for arranging a discrete number of motional parts. Herein, we report a correlated motion of two rotor molecules, which are coaxially arranged at a distance of 1.5 nm, through either Ag+- or Hg2+-assembled helical transmitters, leading to different frequencies of synchronized motion. A helix inversion in the transmitter was proven to strongly correlate the motions of both terminals. The X-ray analysis of the entity determined a quadruple-decker nonanuclear structure of the metal complex comprising two terminal rotor-like ligands closely attached to a central transmitter moiety. H-1 NMR analysis fully demonstrated the synchronized motion of the two rotors coaxially stacked and connected through the transmitter. Since the transmitter is composed of simple helical repeating units, the principle of helix inversion would be an efficient and widely applicable strategy for the long-range transmission of molecular motion.