Preparation of thieno[2,3-b]pyrroles starting from ketene-N,S-acetals
摘要:
Thieno[2,3-b]pyrroles 4 can easily be synthesised in two different ways by using phenyl isothiocyanate and activated methylene compounds. The priority of the formation of the thiophene or pyrrole ring is investigated. (C) 2003 Elsevier Science Ltd. All rights reserved.
STUDIES ON THE ALKYLATION OF β-OXO THIOAMIDES WITH α-BROMOKETONES: SELECTIVE CYCLIZATION OF THE INTERMEDIATE α-OXO KETENE-N, S-ACETALS TO THIOPHENE DERIVATIVES
作者:S. Suma、N. K. Ushakumari、C. V. Asokan
DOI:10.1080/10426509708031604
日期:1997.12.1
substituted aryl methyl ketones in the presence of NaH and DMF to phenyl isothiocyanate on subsequent alkylation with phenacyl bromide or α-bromo propiophenone underwent intramolecular cyclization involving the ketene-N, S-acetal moiety and carbonyl group to afford 2-phenylamino-3-aroyl-4-phenyl-5-methyl/unsubstituted thiophenes. Reaction of enolates derived from acetyl acetone and ethyl acetoacetate under
摘要 在 NaH 和 DMF 存在下,从取代的芳基甲基酮获得的烯醇阴离子加成到异硫氰酸苯酯上,随后与苯甲酰溴或 α-溴苯丙酮进行烷基化反应,进行涉及烯酮-N、S-缩醛部分和羰基的分子内环化反应,得到提供 2-苯基氨基-3-芳酰基-4-苯基-5-甲基/未取代的噻吩。由乙酰丙酮和乙酰乙酸乙酯衍生的烯醇在相似条件下的反应进行分子内醇醛缩合,导致形成取代的噻吩。