A divergent and metal free synthesis of sulfoximine tethered imidazoles, imidazopyridines, imidazothiazoles, imidazobenzothiazines, thiazoles and selenazoles
作者:S. R. K. Battula、V. P. Rama Kishore Putta、G. V. Subbareddy、I. E. Chakravarthy、V. Saravanan
DOI:10.1039/c7ob00601b
日期:——
A divergent and metal free approach has been successfully developed for the synthesis of sulfoximine tethered heterocycles. A key α-bromoalkanone intermediate 3b has been reported for the first time. Various sulfoximine tethered imidazoles, imidazopyridines, thiozoloimidazoles, imidazobenzothiazines, thiazoles and selenazoles are made from this common sulfoximine building block.
Tandem Michael–Nucleouphilic Addition of 2‐Cyclopropylidene Propionaldehyde—A Novel Method for the Synthesis of Spirocyclopropane‐Annulated Heterocycles
作者:Xian Huang、Lei Yu、Zhen‐Hua Chen
DOI:10.1081/scc-200054852
日期:2005.5
Abstract 8‐Methyl‐4‐thia‐6‐aza‐spiro[2.5]oct‐5‐en‐7‐ols and 8‐methyl‐4‐selena‐6‐aza‐spiro[2.5]oct‐5‐en‐7‐ols were synthesized in moderate to good yields via tandem Michael–nucleophilic addition of 2‐cyclopropylidenepropionaldehyde under mild conditions.
Synthesis of Primary Arylselenoamides by Reaction of Aryl Nitriles with Woollins' Reagent
作者:Guoxiong Hua、Yang Li、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1021/ol062053c
日期:2006.11.9
[Structure: see text] The reaction of aryl nitriles with Woollins' reagent followed by water affords a variety of primary arylselenoamides in 60-100% yield. The first crystal structures of two primary selenoamides are reported.
A metal- and base-free domino protocol for the synthesis of 1,3-benzoselenazines, 1,3-benzothiazines and related scaffolds
作者:V. P. Rama Kishore Putta、Raghuram Gujjarappa、Ujjawal Tyagi、Prasad P. Pujar、Chandi C. Malakar
DOI:10.1039/c8ob03058h
日期:——
Efficient and operationally simple protocols have been demonstrated for the synthesis of the title compounds using easily available starting materials under mild conditions, giving a broad range of rarely reported molecules in excellent yields.
An Efficient Access to Selenazoline-4-Carboxylate Derivatives Incorporating Cyclopropyl Groups
作者:Xian Huang、Wan-Li Chen、Hong-Wei Zhou
DOI:10.1055/s-2003-44969
日期:——
5-Spirocyclopropane-annulated selenazoline-4-carboxylates were synthesized in good yield via Michael addition of selenoamide to 2-bromo-2-cyclopropylideneacetate followed by an intramolecular substitution under basic conditions (NaHCO3, MeCN).