Copper-catalyzed cyclization of Z-oximes into 3-methyl-1,2-benzisoxazoles
摘要:
A practical and effective room temperature copper-catalyzed cyclization of Z-oximes is developed. 3-Methyl-1,2-benzisoxazoles are obtained in 58-79% yields, Also, the Z-selective synthesis of o-bromo acetophenone oximes is presented for the first time. (C) 2009 Elsevier Ltd. All rights reserved.
Copper-catalyzed cyclization of Z-oximes into 3-methyl-1,2-benzisoxazoles
摘要:
A practical and effective room temperature copper-catalyzed cyclization of Z-oximes is developed. 3-Methyl-1,2-benzisoxazoles are obtained in 58-79% yields, Also, the Z-selective synthesis of o-bromo acetophenone oximes is presented for the first time. (C) 2009 Elsevier Ltd. All rights reserved.
mild diethylaminosulfur trifluoride/tetrahydrofuran (DAST–THF) system affords imidoyl fluorides. These compounds were isolated, and their structures were confirmed by X-ray single-crystal structure analysis. Reaction of imidoyl fluorides with various nucleophiles efficiently afforded amides, amidines, thioamides, and amine derivatives in high yields. Furthermore, one-pot reaction of in situ generated
用相对温和的二乙氨基三氟化硫/四氢呋喃 (DAST–THF) 系统氟化肟,得到亚氨基氟化物。这些化合物被分离出来,并通过 X 射线单晶结构分析确定了它们的结构。亚氨基氟化物与各种亲核试剂的反应有效地以高产率提供酰胺、脒、硫代酰胺和胺衍生物。此外,由肟原位生成亚氨基氟化物的一锅法反应也适用于这些产品的高效合成。肟立体化学和酸不稳定保护基在该系统中保持完整。
Copper-catalyzed cyclization of Z-oximes into 3-methyl-1,2-benzisoxazoles
A practical and effective room temperature copper-catalyzed cyclization of Z-oximes is developed. 3-Methyl-1,2-benzisoxazoles are obtained in 58-79% yields, Also, the Z-selective synthesis of o-bromo acetophenone oximes is presented for the first time. (C) 2009 Elsevier Ltd. All rights reserved.