具有三氮杂甾醇相关结构的新型高能中间体类似物作为麦角固醇生物合成V的抑制剂[1]。六水-5 H- 咪唑并[1',2':1,2]嘧啶-[4,3- a ]异喹啉和代表新的8,13,15-三氮杂甾类化合物的1-烷基类似物
摘要:
1,2,6,10b,11,12-hexahydro-5 H- 咪唑并[1',2':1,2]嘧啶基[4,3- a ]异喹啉的合成代表了8,13,15的新类型描述了三氮杂甾体。由4-(2-羟基烷基氨基)四氢-2 H 制备四环标题化合物 -pyrimidoisoquinolines,在转化为相应的溴代烷基氨基化合物后,经碱催化的分子内亲核取代环化反应形成所需的带有芳香环A的1-取代的8,13,15-三氮甾类化合物。同核和异核相关1D和2D NMR实验的基础。标题化合物代表在角鲨烯经酶促转化为麦角固醇过程中形成的甾族底物的选定高能中间体(HEI)的三氮杂类似物,并被设计用作HEI的抑制模拟物和潜在的抗真菌药。
Multicomponent Approach to the Synthesis of Oxidized Amides through Nitrile Hydrozirconation
作者:Shuangyi Wan、Michael E. Green、Jung-Hyun Park、Paul E. Floreancig
DOI:10.1021/ol702184n
日期:2007.12.1
"Oxidized" amides, as represented by acyl aminals and acyl hemiaminals, are integral subunits of several natural products that exhibit useful biological activity. In this paper a multicomponent approach to these groups from acylimine intermediates is demonstrated. The acylimines; are accessed through a sequence of nitrile hydrozirconation and acylation, making this highly versatile amide synthesis useful for a range of applications in target- and diversity-oriented synthesis.
Electrogenerated Acid-Catalyzed Reactions of Acetals, Aldehydes, and Ketones with Organosilicon Compounds, Leading to Aldol Reactions, Allylations, Cyanations, and Hydride Additions
electrogenerated acid (EG acid) in the silicon-mediated acid-catalyzed reactions; e.g., aldol reactions, allylations, cyanations, and hydride additions is described. The aldol reaction of acetals 1 with enol trimethylsilyl ethers 3 and 1,2-bis(trimethylsiloxy)alkenes 4 gives the corresponding adducts 5 and 6, respectively. The reaction proceeds smoothly with EG acid derived from perchlorate salts such
Cu(OTf)2 catalyzed trimethylsilyl cyanide addition to carbonyl compounds
作者:P. Saravanan、R.Vijaya Anand、Vinod K. Singh
DOI:10.1016/s0040-4039(98)00594-2
日期:1998.5
Copper (II) triflate was found to catalyzeTrimethylsilyl cyanide addition to a variety of ketones and aldehydes at rt in an efficient manner.
发现在室温下,三氟甲磺酸铜(II)可以有效地催化三甲基甲硅烷基氰化物加成到各种酮和醛中。
Lewis acid catalyzed acylation reactions: scope and limitations
作者:Kusum L Chandra、P Saravanan、Rajesh K Singh、Vinod K Singh
DOI:10.1016/s0040-4020(01)01229-7
日期:2002.2
Acylation of alcohols, thiols, and sugars were studied with a variety of Lewis acids, and it was found that Cu- and Sn(OTf)2 are very efficient in catalyzing the reaction under mild conditions. Among these two catalysts, Cu(OTf)2 was preferred because of its lower cost and relatively higher yield of the acylated product. The reaction was studied in several solvents, but CH2Cl2 was preferred. It was
Cu(OTf)2 was found to be an efficient catalyst in the acylation reaction of alcohols, phenols, amines and thiols with acetic anhydride in CH2Cl2 or acetic acid. A catalytic cycle has been proposed for the acylation reaction.