A Novel and Highly Regioselective Route to Construct Methylthio-Substituted Pyridazines from Aryl Methyl Ketones at Room Temperature
摘要:
A novel and highly regioselective two-step homocoupling/cyclization procedure from easily available aryl methyl ketones and hydrazine hydrate was developed for the synthesis of methylthio-substituted pyridazines at room temperature. The method has remarkable advantages owing to the simple substrates, mild reaction conditions, ease of manipulation, good yields and high regioselectivity.
对二氰基-9,10 蒽、d'α-苯甲酰基 S,S-二烷基磺酰甲烷在 α-二甲基磺基 β-氧代苯乙基上的钝性中间体进行光解、光敏化。在 obtient principalement des 派生 de tetrahydro-1,2,3,4naphtalenones-1, de cyclopropanes et de propiophenones 上的 Par transposition de cet intermediaire
and aryl methyl ketones C(sp3), which enables the direct construction of 4-hydroxybenzil derivatives. This practical method exhibits a broad substrate scope and large-scale applicability and represents a general gateway to the hydroxybenzil natural product family. Mechanistic investigations indicated that the combination of HI with DMSO realized the oxidative carbonylation of aryl methyl ketones, while
Iodine–DMSO-promoted divergent reactivities of arylacetylenes
作者:Suhail A. Rather、Atul Kumar、Qazi Naveed Ahmed
DOI:10.1039/c9cc00346k
日期:——
generation of different structures. The reaction represents the first of its kind, involving the use of different iodine concentrations, temperatures, acids and salt to adjust the selectivity for the synthesis of different alkenes, α-functionalized ketones and α-ketomethylthioesters.
C–H functionalization of terminal alkynes towards stereospecific synthesis of (E) or (Z) 2-methylthio-1,4-ene-diones
作者:Shekaraiah Devari、Arvind Kumar、Ramesh Deshidi、Bhahwal Ali Shah
DOI:10.1039/c4cc10438b
日期:——
efficient metal free self-sorting tandem protocol for stereospecificsynthesis of 2-thio-1,4-enediones involving C-C double bond formation via direct coupling of terminal alkynes has been developed. The method was also extended to the first synthesis of beta-thio-gamma-keto-alpha,beta-unsaturated esters via a cross coupling reaction with ethyl glyoxylate. The reaction relies on a first of its kind
Convergent integration of three self-sorting domino sequences: three-component direct synthesis of 3-methylthio-4-aryl-maleimides from methyl ketones with acetonitrile and DMSO
作者:Qinghe Gao、Shan Liu、Xia Wu、Anxin Wu
DOI:10.1016/j.tetlet.2014.09.099
日期:2014.11
converted to DMS in situ, which subsequently served as a methylthiolation reagent in the reaction. To the best of our knowledge, this protocol provided the first known example of convergent integration of three self-sorting domino sequences.
The convergent and linear domino reactions have been first integrated, for the first time, to provide an efficient synthesis of indole–furan conjugates from indoles, methyl ketones, and 1,3-dicarbonyl compounds.