- PPh3·HBr-DMSO: A Reagent System for Diverse Chemoselective Transformations
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The broad applicability of the hitherto unexplored reagent combination PPh3·HBr-DMSO is exemplified with multiple highly diverse one-step transformations to synthetically useful building blocks, such as flavones, 4H-thiochromen-4-ones, α-hydroxy ketones, 1,4-naphthoquinones (including vitamin K3), 2-bromo-3-substituted-1H-1-indenones, 2-methylthio-1H-1-indenones, 3-butyne-1,2-dione, and 4-pentene-2,3-diones. The simple and mild reaction conditions make the reagent superior in terms of yield and substrate scope in comparison with the existing alternatives.
- Mal, Kanchan,Kaur, Amanpreet,Haque, Fazle,Das, Indrajit
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p. 6400 - 6410
(2015/06/30)
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- NOVEL POLYBENZOFULVENE DERIVATIVES, SYNTHESIS AND USES THEREOF
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The present invention relates to polymers of formula poly-3 (I), their synthesis, intermediates and uses thereof.
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Page/Page column 14-15
(2010/11/30)
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- Condensation of Brominated Products of o-Acetylbenzophenone with Several Primary Amines
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2-Bromo-3-phenylinden-1-one 2 reacted with phenylthiourea to produce 2-phenylimino-8-phenylindenothiazole (heteropentalene) 4 in moderate yield and bis-substituted-indenyl sulfide 5 in low yield.Whereas, from the reaction of 2 with thiourea or its
- Nan'ya, Seiko,Ishida, Hirofumi,Moiji, Ester J.,Butsugan, Yasuo,Bajji, Ashok C.
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p. 401 - 404
(2007/10/02)
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- Synthesis of Indenones via Palladium-Catalyzed Annulation of Internal Alkynes
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A number of 2,3-disubstituted 1-indenones have been prepared in fair to good yields by treating o-iodo- or o-bromobenzaldehyde with various internal alkynes in the presence of a palladium catalyst.Synthetically, the methodology provides an especially conv
- Larock, R. C.,Doty, M. J.,Cacchi, S.
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p. 4579 - 4583
(2007/10/02)
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- Synthesis of Indenobenzothiazine Derivatives from 2-Bromoinden-1-ones
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2-Bromoinden-1-ones 2 were condensed with 6-substituted 3-aminopyridine-2(1H)-thiones to produce a new type of 4-azaindenobenzothiazine derivatives 3.Substituted 6-phenylindenobenzothiazines 4 were also prepared by reacting 2-bromo
- Bajji, Ashok C.,Nan'ya, Seiko,Butsugan, Yasuo
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p. 361 - 363
(2007/10/02)
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- Condensation Products of 2-Bromo-3-substituted-inden-1-ones with Several Primary Amines
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2-Bromo-3-substituted-inden-1-ones 2 reacted with L-cysteine or 2-aminobenzenethiol to produce 2,3-dihydro-5-phenylidenothiazine in moderate yield or 6-substituted-indenobenzothiazines in good yield.The debrominated oxime and the p
- Nan'ya, Seiko,Kitahara, Takeo,Fujii, Kenichi,Bajji, Ashok C.,Butsugan, Yasuo
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p. 1525 - 1528
(2007/10/02)
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- A Facile One-Pot Synthesis of Vicinal Di- and Triketones from α-Methylene Ketones by NBS-DMSO Oxidation
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The reaction of 1,2-diarylethanones (1a-u) with N-bromosuccinimide in anhydrous dimethyl sulphoxide afforded diarylethanediones (2a-u) in excellent yields.Under similar conditions, 1-phenyl-2-butanone (3) gave 1-phenyl-1,2-butanedione (4) in fair yield in addition to a small amount of 1-phenyl-3-methylthio-1,2-butanedione (5) and 1-phenyl-1-methylthio-2-butanone (6). 4-Phenyl-2-butanone (7), 1,3-diphenyl-2-propanone (9), and 1,3-diphenyl-1,3-propanedione (10) gave the corresponding triketones monohydrate (8) and (11). 1-Indanone (12), 2-indanone (13), and 1,3-indandione (14) gave ninhydrin (15) in good yields.In the case of 3-phenyl-1-indanone (16), 3-phenyl-2-bromo-1-indanone (17), 3-phenyl-2-bromo-1-indenone (18) and 3-phenyl-1-indenone (19) were obtained. 1-Phenyl-1-propanone (20) and 1-phenyl-1-butanone (22) gave the corresponding α-(methylthio)ketones (21) and (22). 1,3,3-Triphenylpropanone (24a) and 1-phenyl-3-methyl-1-butanone (24b) yielded only the corresponding α-bromoketones (25a,b) in good yields.These α-bromoketones, however, afforded the corresponding α-diketones (26a,b) in moderate yields when α-bromoketones reacted with dimethyl sulphoxide in the presence of AgBF4.
- Tatsugi, Jiro,Izawa, Yasuji
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p. 2747 - 2763
(2007/10/02)
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- A new procedure for the in situ generation of methylene ketenes
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The reaction of pentacarbonylmanganate anion 3 and 2-bromopropenoyl chlorides 2 leads to 2,4-alkylidenecyclobutane-1,3-diones 5.The latter are formed from dimerization of the corresponding methylene ketenes 1 so that the reaction of 2 and 3 constitutes a
- Masters, Andrew P.,Sorensen, Ted S.,Tran, Phu Mahn
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p. 1499 - 1502
(2007/10/02)
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