A Convenient One-Pot Synthesis of Ketene Dithioacetals
作者:Didier Villemin、Abdelkrim Ben Alloum
DOI:10.1055/s-1991-26449
日期:——
An easy synthesis of ketene dithioacetals 2 and 3 by the condensation of carbon disulfide and active methylene compounds 1 with subsequent alkylation in the presence of potassium fluoride is described.
Cycloaromatization of α-oxoketene dithioacetals and β-oxodithioacetals with benzyl-,1-(naphthylmethyl) and 2-(naphthylmethyl)magnesium halides: Synthesis of condensed polynuclear aromatic hydrocarbons
作者:Ch.Srinivasa Rao、Maliakel P Balu、Hiriyakkanavar Ila、Hiriyakkanavar Junjappa
DOI:10.1016/s0040-4020(01)86411-5
日期:1991.1
An efficient route for the synthesis of substituted naphthalenes, phenanthrenes and other polynuclear aromatic hydrocarbons has been developed. The methodology involves 1,2- (or sequential 1,4- and 1,2-) addition of either benzyl, 1-(naphthylmethyl) or 2-(naphthylmethyl) magnesium halides to α-oxoketenedithioacetals or β-oxodithioacetals followed by borontrifluoride etherate catalyzed cycloaromatization
α-Oxoketene Dithioacetals Mediated Benzoannelation of Aromatic Heterocycles: an Efficient Regiocontrolled Synthesis of Highly Substituted and Polycyclic Benzo[b]thiophenes
作者:J.R. Suresh、Okram Barun、H. Ila、H. Junjappa
DOI:10.1016/s0040-4020(00)00722-5
日期:2000.10
An efficient regiocontrolled synthesis of highly substituted and complex polycyclic benzo[b]thiophenes has been developed via our benzoannelation strategy involving conjugate addition–displacement on a variety of α-oxoketenedithioacetals by carbanions derived from 2- and 3-cyanomethylthiophenes followed by acid induced cyclization of the resulting conjugate adducts.
通过我们的苯甲酰化策略,开发了一种高效的区域控制的合成方法,该方法可控制区域取代基和复杂的多环苯并[ b ]噻吩,包括通过2-和3-氰基甲基噻吩的碳负离子在各种α-氧杂环丁烯二硫缩醛上进行共轭加成-置换,然后进行酸诱导的环化反应生成的共轭加合物。
α-Oxoketene dithioacetal mediated aromatic annulation: highly efficient and concise synthetic routes to potentially carcinogenic polycyclic aromatic hydrocarbons
Highly efficient regiospecific routes to potentially carcinogenic polycyclic aromatic hydrocarbons such as substituted benzo[c]phenanthrenes, benzo[c]fluorenes, 16,17-dihydro-11-methyl-15[H]cyclopenta[a]phenanthrene, 5-methyl-7,8,9,10-tetrahydrochrysene and 1,4-dimethylphenanthrene have been developed. The overall strategy involves our aromatic annulation protocol through base induced conjugate addition–elimination
高效的区域特异性途径转化为潜在的致癌多环芳烃,例如取代的苯并[ c ]菲,苯并[ c ]芴,16,17-二氢-11-甲基-15 [ H ]环戊[ a ]菲,5-甲基-7已经开发了8,9,10-四氢丙烯和1,4-二甲基菲。总体策略涉及我们的芳族环化方案,即通过碱诱导的共轭加成反应-在环和无环α-氧杂环丁烯二硫缩醛上用适当的芳基乙腈消除,然后酸诱导所得的共轭加合物进行环脱水。随后环化产物的还原性脱硫甲基化(阮内镍)和脱氢(DDQ)以高收率提供了甲基取代的PAH。
Regio- and chemoselective conjugate 1,4-reduction of α-oxoketene dithioacetals with sodium borohydride and sodium cyanoborohydride
Theα-oxoketene dithioacetals are shown to undergo conjugate 1,4-reduction in highly regio- and chemoselective manner with sodium borohydride in acetic acid to afford the corresponding β-oxodithioacetals in good yields. These results have been rationalized according to HSAB principle in terms of 'hard soft affinity inversion' concept. The reduction of with sodium cyanoborohydride also proceeds in 1