An efficient non-reductive synthesis of 3-aminomethylindole (6) was developed from gramine (1) via 3-phthalimidomethylindole (2). The reactions of amine 6 with substituted methyl dithiobenzoates gave 3-(arylthiocarbonylaminomethyl)indoles. The Hugerschoff ring-closure reactions of the thiobenzamide intermediates (11a–f) with phenyltrimethylammonium tribromide and subsequent basic treatment furnished
一种有效的非还原性合成的3-氨基甲基吲哚(6)是由草胺(1)通过3-phthalimidomethylmethylindole(2)合成的。胺6与取代的二硫代苯甲酸甲酯的反应得到3-(芳基硫代羰基氨基甲基)吲哚。硫代苯甲酰胺中间体(11a – f)与苯基三甲基三溴化铵的Hugerschoff闭环反应和随后的基本处理提供了2-芳基噻嗪[6,5- b ]吲哚衍生物(14a – f)。通过使用后者的溴源,植物抗毒素环油菜籽素(8制备)的产率要比先前所述的高得多。通过IR,1 H和13 C NMR光谱,包括2D-HMQC,2D-HMBC和DEPT测量,阐明了新产品的结构。
Reaction of 1,3-Bis(het)arylmonothio-1,3-diketones with Sodium Azide: Regioselective Synthesis of 3,5-Bis(het)arylisoxazoles via Intramolecular N–O Bond Formation
作者:Mary Antony P、Gantala L. Balaji、Pethaperumal Iniyavan、Hiriyakkanavar Ila
DOI:10.1021/acs.joc.0c02216
日期:2020.12.4
An efficient newsynthesis of 3,5-bis(het)arylisoxazoles, involving the reaction of 1,3-bis(het)arylmonothio-1,3-diketones with sodiumazide in the presence of IBX catalyst, has been reported. The reaction proceeds at room temperature in high yields and is applicable to a broad range of substrates including the synthesis of 5-methyl-3-arylisoxazoles, a key subunit present in several β-lactamase-resistant
Sequential One-Pot Synthesis of Tri- and Tetrasubstituted Thiophenes and Fluorescent Push–Pull Thiophene Acrylates Involving (Het)aryl Dithioesters as Thiocarbonyl Precursors
作者:Anand Acharya、G. Parameshwarappa、B. Saraiah、H. Ila
DOI:10.1021/jo502429c
日期:2015.1.2
An efficient, one-pot three component synthesis of highly functionalized tri- and tetrasubstituted thiophenes has been reported involving (het)aryl dithioesters as thiocarbonyl precursors. Thus, sequential base mediated condensation of readily available (het)aryl active methylene ketones with (het)aryl dithioesters followed by S-alkylation of the resulting enethiolate salts with activated halomethylene
Synthesis of Substituted Benzo[<i>b</i>]thiophenes via Base-Promoted Domino Condensation–Intramolecular C–S Bond Formation
作者:Yogendra Kumar、Hiriyakkanavar Ila
DOI:10.1021/acs.orglett.1c00085
日期:2021.3.5
A novel synthesis of 2,3-substituted benzothiophenes is reported, involving a tandem base-mediated condensation of o-iodoarylacetonitriles/acetates/ketones with (hetero)aryldithioesters and an intramolecular C–S bond formation. The reaction affords diversely substituted benzothiophenes and heterofused thiophenes in excellent yields.
dithiobenzoates. The Hugerschoff reactions of thiobenzamides (14a–e) with phenyltrimethylammonium tribromide provided the rare title 2-arylthiazino[5,6-b]indoles (15a–e) in good yields. A convenient one-pot approach for the synthesis of 2-phenyl-1,3-thiazino[5,6-b]indole (15a) from 2-aminomethylindole (9) is also described.
通过使2-氨基甲基吲哚(9)与取代的苯甲酰氯反应,然后使用Lawesson试剂进行硫化,可以制备2-硫代苯甲酰胺基甲基吲哚衍生物(14a – e)。或者,这些硫代酰胺是在胺存在下,或在室温下借助取代的二硫代苯甲酸甲酯,通过使用取代的苯甲醛以一种有效的方式,从胺中一步一步地从胺中获得的。硫代苯甲酰胺(14a – e)与三溴化苯基三甲基铵的Hugerschoff反应提供了罕见的标题2-芳基噻嗪[5,6- b ]吲哚(15a – e),收益率很高。还描述了一种方便的一锅法,由2-氨基甲基吲哚(9)合成2-苯基-1,3-噻嗪并[5,6- b ]吲哚(15a)。