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.
Aliphatic and aromaticprimaryselenoamides 2 were isolated by the reaction of the corresponding aliphatic and aromatic nitriles with potassium 4-methylselenobenzoate in the presence of BF3·Et2O in moderate from high yields.
The reaction of primary selenoamides with bisacyl chlorides in the presence of Et3N was investigated. By the reaction with malonyl chloride, 6-hydroxy-1,3-selenazin-4-ones were provided in high yield. By the reactions with succinyl chloride, glutaryl chloride, and phthaloyl chloride, the corresponding selenoanhydrides were obtained in moderate yields, respectively.
Aryl nitriles react smoothly with sodium hydrogen selenide, itself prepared in situ from selenium and sodium borohydride, in ethanol to give the corresponding primary selenoamides in moderate to good yield.
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.