2-hexylbuta-1,3-diene 在
氧气 、 Rose Bengal bis(triethylammonium) salt 作用下,
以
二氯甲烷 为溶剂,
反应 6.0h,
以62%的产率得到4-hexyl-3,6-dihydro-1,2-dioxine
参考文献:
名称:
Dihydroxylation of 4-Substituted 1,2-Dioxines: A Concise Route to Branched Erythro Sugars
摘要:
The synthesis of 2-C-branched erythritol derivatives, including the plant sugar (+/-)-2-C-methylerythritol 2, was achieved through a dihydroxylation/reduction sequence on a series of 4-substituted 1,2-dioxines 3. The asymmetric dihydroxylation of 1,2-dioxines was examined, providing access to optically enriched dihydroxy 1,2-dioxanes 4. The synthesized 1,2-dioxanes were converted to other erythro sugar analogues and tetrahydrofurans through controlled cleavage of the endoperoxide linkage.
Copper complexes generated in situ from CuCl2, alkylGrignardreagents, and 1,3‐dienes play important roles as catalytic active species for the 1,2‐hydroalkylation of 1,3‐dienes by alkylfluorides through CF bond cleavage. The alkyl group is introduced to an internal carbon atom of the 1,3‐diene regioselectively, thus giving rise to the branched terminal alkene product.
The cross-coupling reactions of 2-(1,3-butadienyl)magnesium chloride (1) with aryl and alkyl iodides were investigated in the presence of transition metal catalysts. Tetrakis(triphenylphosphine)pal...
Chemoselective Construction of Substituted Conjugated Dienes Using an Olefin Cross-Metathesis Protocol
作者:Timothy W. Funk、Jon Efskind、Robert H. Grubbs
DOI:10.1021/ol047929z
日期:2005.1.1
[Reaction: see text] Various substituted conjugateddienes have been made by olefin cross-metathesis. Using either electronic or steric "protection," one of the olefins of the conjugateddiene was deactivated relative to the other for cross-metathesis. The reactions proceed with very high chemoselectivity and, when steric deactivation is used, very high diastereoselectivity.
Ring Scission of Diastereomeric 4-Butylspiropentylcarbinyl Radicals as a Chemical Model for Identifying Enzyme-Catalyzed FAD Adducts Resulting from Spiropentylacetyl-CoA
作者:Lev Lis、Elena S. Koltun、Hung-wen Liu、Steven R. Kass
DOI:10.1021/ja0114862
日期:2002.2.1
4-dibutylspiropentanes (17a and 17b) with C(1) and C(2) symmetry. Each bromide was used to generate its corresponding spiropentylcarbinyl radical (18a and 18b) via its AIBN-initiated tri-n-butyltin hydride reduction. The radical-trapped products are identified, the preferred ring scission mode is identified (C1[bond] C2 bond cleavage), and the estimated rates for the ringopening of 4-butylspiropentylcarbinyl radical
A Four-Carbon Unit Reagent for the Regiospecific Synthesis of 2-Alkyl-Substituted 1,3-Butadienes
作者:Alan R. Katritzky、Larisa Serdyuk、Dorin Toader、Xiaojing Wang
DOI:10.1021/jo9818881
日期:1999.3.1
2-Alkyl-substituted butadienes are synthesized starting from a masked butadiene reagent, which allows the regiospecific synthesis of 2-alkylbutadienes by lithiation and subsequent reaction with alkyl halides or aliphatic aldehydes. The regioselectivity of the reaction with allylichalides and aliphatic and aromatic aldehydes is studied.