121666-84-0Relevant articles and documents
Catalyst-free imidation of allyl sulfides with chloramine-T and subsequent [2,3]-sigmatropic rearrangement
Jiang, Yubo,Mo, Fanyang,Qiu, Di,Kuang, Chunxiang,Zhang, Yan,Wang, Jianbo
, p. 2029 - 2035 (2012/11/07)
A facile synthesis of various allyl sulfonamides based on imidation of allyl sulfides with chloramine-T and subsequent [2,3]-sigmatropic rearrangement has been achieved without metal catalysts. The reaction completes smoothly within 10 min, providing excellent yields in environment friendly solvent of alcohol. Functional groups such as bromine, hydroxyl, protected amido and aldehyde are tolerant under this condition.
DECHALCOGENATIVE METHODS FOR THE PREPARATION OF ALLYLIC SULFIDES
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Page/Page column 24, (2008/12/08)
A dechalcogenative method for the preparation of an allylic sulfide comprises contacting an activated chalcogenide of Formula (I) with a thiol of Formula (II) for a period of time sufficient to form an intermediate of Formula (III), and supplying sufficient activation energy to the intermediate of Formula (III), in a suitable solvent, preferably in the absence of a phosphine or other thiophile, to induce a [2,3]-sigmatropic rearrangement therein to form an allylic sulfide of Formula (IV), with concomitant loss of chalcogen Z, as set forth in the following reaction scheme, wherein X is an activating group selected from the group consisting of CN, S-pyridyl, S-heteroaryl, SO2-aryl, and SO3Y; Y is an alkali metal ion; Z is Se or S; R1, R2, R3, R4, and R5 are each independently H or a hydrocarbon moiety; and R is an organic moiety.
Dechalcogenative allylic selenosulfide and disulfide rearrangements: Complementary methods for the formation of allylic sulfides in the absence of electrophiles. Scope, limitations, and application to the functionalization of unprotected peptides in aqueous media
Crich, David,Krishnamurthy, Venkataramanan,Brebion, Franck,Karatholuvhu, Maheswaran,Subramanian, Venkataraman,Hutton, Thomas K.
, p. 10282 - 10294 (2008/03/12)
Primary allylic selenosulfates (seleno Bunte salts) and selenocyanates transfer the allylic selenide moiety to thiols giving primary allylic selenosulfides, which undergo rearrangement in the presence of PPh3 with the loss of selenium to give allylically rearranged allyl alkyl sulfides. This rearrangement may be conducted with prenyl-type selenosulfides to give isoprenyl alkyl sulfides. Alkyl secondary and tertiary allylic disulfides, formed by sulfide transfer from allylic heteroaryl disulfides to thiols, undergo desulfurative allylic rearrangement on treatment with PPh3 in methanolic acetonitrile at room temperature. With nerolidyl alkyl disulfides this rearrangement provides an electrophile-free method for the introduction of the farnesyl chain onto thiols. Both rearrangements are compatible with the full range of functionality found in the proteinogenic amino acids, and it is demonstrated that the desulfurative rearrangement functions in aqueous media, enabling the derivatization of unprotected peptides. It is also demonstrated that the allylic disulfide rearrangement can be induced in the absence of phosphine at room temperature by treatment with piperidine, or simply by refluxing in methanol. Under these latter conditions the reaction is also applicable to allyl aryl disulfides, providing allylically rearranged allyl aryl sulfides in good yields.
Palladium-catalyzed coupling reaction of vinyl epoxides, diol acetonides, and diol carbonates with organobismuth compounds
Kang,Ryu,Hong,Kim,Lee,Jung
, p. 2365 - 2371 (2007/10/03)
The palladium-catalyzed arylation reaction of vinyl epoxides with organobismuth compounds afforded the aryl-substituted (E)-allylic alcohols via ring opening of epoxides. Alternatively, the palladium-catalyzed reaction of diol acetonides and carbonates wi
Fe(II)-catalyzed imidation of allyl sulfides and subsequent [2,3]- sigmatropic rearrangement. Preparation of α-branched N-tert-butyloxycarbonyl (Boc)-protected N-allylamines
Bach, Thorsten,Koerber, Christina
, p. 2358 - 2367 (2007/10/03)
Allyl aryl sulfides 1 and 5 were shown to undergo an imidation/[2,3]- sigmatropic rearrangement reaction upon treatment with N-tert- butyloxycarbonyl azide (BocN3) and catalytic amounts of FeCl2 in CH2Cl2. The N-Boc-protected N-allyl sulfenamides 3 and 21 were obtained in yields between 48 and 75% (12 examples). Whereas the reaction is well suited for the transformation of α-unbranched sulfides to α-branched sulfenamides, the enantiomerically pure α-branched sulfides 10 and 13 reacted sluggishly. The corresponding sulfenamides 22 and 23 were obtained in only moderate enantiomeric excess (36-39% ee). A reaction mechanism is proposed that postulates the intermediacy of an N-Boc-substituted Fe(IV)-nitrene complex 14 acting as the imidation reagent in the catalytic cycle. Possible side reactions are discussed. The benzenesulfenamides 3 were further converted into N-Boc-N-allylamines 4 by removal of the phenylsulfanyl group. Bu3SnH in benzene was found to be the reagent of choice for the deprotection of α- branched amines that bear a secondary allyl substituent (five examples, 71- 93% yield). This method failed for the α-branched amines 3i-k with a tertiary allyl substituent. The phenylsulfanyl group was finally removed with P(OEt)3/NEt3 in CH2Cl2 (three examples, 43-62% yield).
Et3B-Induced Radical Reaction of 1,3-Diene Monoxide with C6F13I, PhSH, or Ph3GeH
Ichinose, Yoshifumi,Oshima, Koichiro,Utimoto, Kiitiro
, p. 1437 - 1440 (2007/10/02)
Treatment of 3,4-epoxy-1-butene with C6F13I, PhSH, or Ph3GeH in the presence of Et3B provides 4-substituted-2-buten-1-ol in good yield.Et3B-Ph3SnH mediated intramolecular alkylation of 1,3-diene monoxide are also described.
