Acid-Catalyzed Cyclization Reactions of Substituted Acetylenic Ketones: A new Approach for the Synthesis of 3-Halofurans, Flavones, and Styrylchromones
作者:Daniel Obrecht
DOI:10.1002/hlca.19890720305
日期:1989.5.3
Acetylenic acetals of type I(Scheme 1) and acetylenic ketones of type III(Scheme 1), 37 and 38(Scheme 7) are versatile synthetic precursors for the synthesis of various heterocycles by acid-catalyzed cyclization reactions. By this way, substituted 3-halofurans of type II and IV(Scheme 1) and flavones and styrylchromones (Scheme 7) can be synthesized in good-to-excellent yields. The high degree of regioselectivity
Gold catalysed synthesis of 3-alkoxyfurans at room temperature
作者:Matthew N. Pennell、Robert W. Foster、Peter G. Turner、Helen C. Hailes、Christopher J. Tame、Tom D. Sheppard
DOI:10.1039/c3cc48290a
日期:——
3-Alkoxyfurans can be readily prepared from aldehydes via a gold-catalysed cyclisation of propargylic alcohols bearing an acetal unit.
3-烷氧基呋喃可以通过含有缩醛基团的丙炔醇经金催化环化制备。
Thione Reductions for Preparation of Five-Membered Heterocycles
作者:D.R. Williams、J.L. Moore
DOI:10.1016/s0040-4039(00)81401-x
日期:——
Facile reductions with tri-n-butyltinhydride convert a variety of five-membered 1,3-disubstituted heterocyclic thiones to the corresponding saturated derivatives.
与三容易降低Ñ -butyltin氢化转换各种五元1,3-二取代的杂环硫酮为相应的饱和衍生物。
Thiazole and thiophene compounds
申请人:Gillespie Paul
公开号:US08404859B2
公开(公告)日:2013-03-26
Provided herein are compounds of the formula (I):
as well as pharmaceutically acceptable salts thereof, wherein the substituents are as those disclosed in the specification. These compounds, and the pharmaceutical compositions containing them, are useful for the treatment of inflammatory diseases and disorders such as, for example, asthma and COPD.
Kinetic Resolution of Homoaldols via Catalytic Asymmetric Transacetalization
作者:Ilija Čorić、Steffen Müller、Benjamin List
DOI:10.1021/ja108642s
日期:2010.12.15
The highly enantioselective kinetic resolution of homoaldols via a transacetalization reaction has been achieved. A novel phosphoric acid, STRIP, based on a spirocyclic 1,1'-spirobiindane backbone was designed and identified as a superior catalyst for this transformation. Remarkably, both secondary and tertiary homoaldols gave equally excellent results.