Direct Zn–diamine promoted reduction of CO and CN bonds by polymethylhydrosiloxane in methanol
作者:Virginie Bette、André Mortreux、Christian W. Lehmann、Jean-François Carpentier
DOI:10.1039/b210144k
日期:2003.1.23
Ketones and imines are chemoselectively reduced at room temperature in methanol to the corresponding alcohols and amines in high yields in a one-step procedure using polymethylhydrosiloxane (PMHS) and a simple zincâdiamine catalyst.
Sulfur-containing heterocycles derived by the reaction of hydroxy-amides and Lawesson's reagent
作者:Takehiko Nishio
DOI:10.1016/0040-4039(95)01232-7
日期:1995.8
A simple one-pot reaction between hydroxy-amides (1) located, 1,3- or 1,4- to each other, and Lawesson's reagent (LR) gives sulfur-containg heterocycles such as tetrahydrothiophene-2-imines (4), tetrahydrothiophene-2-thione (5) and tetrahydrothiopyrandash2-thione (6). Similar reaction of 3-N-acylamino-alcohols (7) affords thiazoline derivatives (9).
Hydrogenation of BF2 complexes with 1,3-dicarbonyl ligands
作者:Bogdan Štefane、Slovenko Polanc
DOI:10.1016/j.tet.2009.01.017
日期:2009.3
The catalytic hydrogenation (H-2, Pd/C) of a set of BF2 complexes with a 1,3-dicarbonyl Structural unit leading to monocarbonyl compounds has been studied. The transformation presented is general for the aryl-substituted derivatives and occurs under mild conditions (H-2, 1 bar, 25 degrees C) in methanol or THF. (C) 2009 Elsevier Ltd. All rights reserved.
Thionation of ω-hydroxy amides with Lawesson's reagent: Synthesis of thioenamides and sulfur-containing heterocycles
作者:Takehiko Nishio、Hiroshi Sekiguchi
DOI:10.1016/s0040-4020(99)00200-8
日期:1999.4
The thionation of omega-hydroxy amides with Lawesson's reagent [LR: 2,4-bis(p-methoxyphenyl)- 1,3,2,4-dithiaphosphetane-2,4-disulfide] is described. The treatment of 3-hydroxy amides 1 with LR exclusively gave thioenamides 2 in fair yields. The treatment of 4-hydroxy amides 5 with LR yielded sulfur-containing heterocycles such as tetrahydrothiophene-2-imines 6 and tetrahydrothiophene-2-thione 7a through cyclization of intermediates, 4-mercapto amides 8. The 5-hydroxy amides 13 also reacted with LR to afford tetrahydrothiopyrane-2-thione 14 as the the sole product. (C) 1999 Elsevier Science Ltd. All rights reserved.