合成了一系列七个非经典的三个碳原子桥接的2,4-二氨基-5-取代的吡咯并[2,3- d ]-吡啶1a-g作为二氢叶酸还原酶的潜在抑制剂。二醇7a-g的选择性氧化得到α-羟基酮8a-g。随后与丙二腈缩合,得到必需的2-氨基-3-氰基-4-取代的呋喃前体9a-g。一步在回流的乙醇中与胍进行环缩合,得到三个碳原子桥接的2,4-二氨基-5-取代的吡咯并[2,3- d ]-嘧啶1a-g。初步生物学结果表明,这些化合物对卡氏肺孢子虫,弓形虫,鸟形分枝杆菌和大鼠肝脏中的二氢叶酸还原酶表现出中等抑制作用,IC 50值在0.66μM-70.1μM范围内,并且某些化合物对弓形虫二氢叶酸还原酶的选择性很小。。
合成了一系列七个非经典的三个碳原子桥接的2,4-二氨基-5-取代的吡咯并[2,3- d ]-吡啶1a-g作为二氢叶酸还原酶的潜在抑制剂。二醇7a-g的选择性氧化得到α-羟基酮8a-g。随后与丙二腈缩合,得到必需的2-氨基-3-氰基-4-取代的呋喃前体9a-g。一步在回流的乙醇中与胍进行环缩合,得到三个碳原子桥接的2,4-二氨基-5-取代的吡咯并[2,3- d ]-嘧啶1a-g。初步生物学结果表明,这些化合物对卡氏肺孢子虫,弓形虫,鸟形分枝杆菌和大鼠肝脏中的二氢叶酸还原酶表现出中等抑制作用,IC 50值在0.66μM-70.1μM范围内,并且某些化合物对弓形虫二氢叶酸还原酶的选择性很小。。
Efficient Enantioselective Synthesis of Optically Active Diols by Asymmetric Hydrogenation with Modular Chiral Metal Catalysts
作者:Renat Kadyrov、René M. Koenigs、Claus Brinkmann、David Voigtlaender、Magnus Rueping
DOI:10.1002/anie.200902835
日期:2009.9.28
Valuable vicinal 1,2‐diols can be prepared with high enantioselectivity by the asymmetric ruthenium‐catalyzed hydrogenation of aryl‐ and alkyl‐substituted α‐hydroxy ketones (see scheme). The ligands, which are distinguished by their modular construction, display excellent enantioface differentiation.
TiCl4-promoted intramolecular cyclization of 4-methoxy-5-arylethyl-1,3-dioxolan-2-ones: an expedient method to prepare 2-tetralones
作者:Yung-Son Hon、Rammohan Devulapally
DOI:10.1016/j.tetlet.2009.03.185
日期:2009.6
DABCO is a very effective calalyst in the formation of 4-methoxy-5-arylethyl-1,3-dioxolan-2-ones 12 from the corresponding alpha-carbonatoaldehyde. Intramolecular, cyclization of cyclic carbonates 12 promoted by TiCl4 affords 2-tetralones 13 containing a variety of substituents in high yields 2009 Elsevier Ltd. All rights reserved
Dual Role of H<sub>2</sub>O<sub>2</sub> in Palladium-Catalyzed Dioxygenation of Terminal Alkenes
A pallaclium-catalyzed, environmentally friendly dioxygenation reaction of simple alkenes has been developed that enabled rapid assembly of valuable a-hydroxy ketones with high atom economy. Notably, control experiments and 180 isotope-labeling experiments established that H2O2 played a dominant dual role in this transformation.