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
作者:David Crich、Venkataramanan Krishnamurthy、Franck Brebion、Maheswaran Karatholuvhu、Venkataraman Subramanian、Thomas K. Hutton
DOI:10.1021/ja072969u
日期:2007.8.1
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 alkylsulfides. This rearrangement may be conducted with prenyl-type selenosulfides to give isoprenyl alkylsulfides. Alkyl secondary
One-pot Synthetic Method of Allyl Sulfides: Samarium-induced Allyl Bromide Mediated Reduction of Alkyl Thiocyanates and Diaryl Disulfides in Methanolic Medium
作者:Zhuang-Ping Zhan、Kai Lang
DOI:10.1246/cl.2004.1370
日期:2004.10
A convenient synthetic method of allyl sulfides by the treatment of alkyl thiocyanates or diaryl disulfides with Sm and allyl bromide in methanol has been developed.
通过在甲醇中用 Sm 和烯丙基溴处理硫氰酸烷基酯或二芳基二硫化物,开发出了一种简便的烯丙基硫化物合成方法。
A Novel Synthesis of Allyl Sulfides by Organosamarium Reagents†
作者:Zhuangping Zhan、Yongmin Zhang
DOI:10.1039/a706725i
日期:——
Organosamarium reagents react with sodium alkyl thiosulfates to afford allylsulfides; a reaction mechanism involving organosamarium(II) and organosamarium (III) intermediates is suggested.
DECHALCOGENATIVE METHODS FOR THE PREPARATION OF ALLYLIC SULFIDES
申请人:Crich David
公开号:US20100222549A1
公开(公告)日:2010-09-02
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.
Allylic Selenosulfide Rearrangement: A Method for Chemical Ligation to Cysteine and Other Thiols
作者:David Crich、Venkataramanan Krishnamurthy、Thomas K. Hutton
DOI:10.1021/ja057521c
日期:2006.3.1
Alkylation of potassium selenosulfate with allylic halides gives Se-allyl seleno Bunte salts. On reaction with thiols at room temperature, these afford mixed dialkyl selenosulfides, which undergo 2,3-sigmatropic rearrangement with loss of selenium, either spontaneously or with assistance by triphenylphosphine, thereby providing mixed dialkyl sulfides and a new permanent chemical ligation method. The process is illustrated through the lipidation of cysteine-containing tripeptides and by the allylation of 1-thioglucose tetraacetate.