描述了铜介导的醛的C(sp 2)–H三氟甲基化。在室温下,醛与(bpy)Cu(CF 3)3,Et 3 SiH和K 2 S 2 O 8在丙酮水溶液中的反应以令人满意的产率提供了相应的三氟甲基酮。该协议适用于脂族和芳族醛,并具有广泛的底物范围和广泛的官能团相容性。提出了一种涉及Cu(II)介导的酰基三氟甲基化的机理。
微波辅助合成2-芳基-2-恶唑啉,5,6-二氢-4 H -1,3-恶嗪和4,5,6,7-四氢-1,3-恶氮杂s
摘要:
提出了通过微波辅助多磷酸(PPA)酯促进的ω-氨基醇的环化反应合成5至7元环亚氨基醚的第一个通用程序。使用聚磷酸乙酯/ CHCl 3有效地制备了2-芳基-2-恶唑啉和5,6-二氢-4 H -1,3-恶嗪。在无溶剂条件下,多磷酸三甲基甲硅烷基酯可合成迄今未报道的4,5,6,7-四氢-1,3-氧杂氮杂pine。该方法具有良好的收率和优异的收率,并且反应时间短。在手性底物中研究了PPA酯的反应机理和作用。
Hydrolysis and alcoholysis of carboxamides derived from primary aliphatic amines were achieved under mild conditions. Amide exchange reaction between carboxamides and N1-acyl-N1, N2-di (p-nitrophenyl) formamidines (1) gave N1-acyl-N1-alkyl-N2-(p-nitrophenyl)formamidines (2) which were readily hydrolyzed or alcoholyzed to give N1-alkyl-N2-(p-nitrophenyl)formamidines (4) and carboxylic acid or its ester. Compounds 4 were hydrolyzed to give aliphatic amine and N-formyl-p-nitroaniline in the presence of acetic acid or hydrochloric acid at room temperature. For the alcoholysis of N-acyl derivatives of amino alcohols, protection of the hydroxyl substituent by an acyl group was essential because the reaction of 1 and N-acyl derivatives of amino alcohols was quite complex. Alcoholysis of N-ethyl-N, N'-ethylenebis (p-chlorobenzamide) (8a) by this method gave N-(2-aminoethyl)-N-ethyl-p-chlorobenzamide (8b). Thus, the selective alcoholysis of diacyl derivative of diamines, which contain primary and secondary amino groups, was achieved.
A microwave-assisted synthesis of solid-supported reagents for the acylation of amines has been developed, and the same methodology has been successfully applied to the preparation of acylating agents anchored on different solid supports. Similarly, alcohols, phenols, and thiophenols have been easily acylated using these reagents under microwave irradiation.
Microwave-Assisted Synthesis of 2-Aryl-2-oxazolines, 5,6-Dihydro-4<i>H</i>-1,3-oxazines, and 4,5,6,7-Tetrahydro-1,3-oxazepines
作者:María C. Mollo、Liliana R. Orelli
DOI:10.1021/acs.orglett.6b03122
日期:2016.12.2
general procedure for the synthesis of 5- to 7-membered cyclic iminoethers by microwave-assisted cyclization of ω-amido alcohols promoted by polyphosphoric acid (PPA) esters is presented. 2-Aryl-2-oxazolines and 5,6-dihydro-4H-1,3-oxazines were efficiently prepared using ethyl polyphosphate/CHCl3. Trimethylsilyl polyphosphate in solvent-free conditions allowed for the synthesis of hitherto-unreported
提出了通过微波辅助多磷酸(PPA)酯促进的ω-氨基醇的环化反应合成5至7元环亚氨基醚的第一个通用程序。使用聚磷酸乙酯/ CHCl 3有效地制备了2-芳基-2-恶唑啉和5,6-二氢-4 H -1,3-恶嗪。在无溶剂条件下,多磷酸三甲基甲硅烷基酯可合成迄今未报道的4,5,6,7-四氢-1,3-氧杂氮杂pine。该方法具有良好的收率和优异的收率,并且反应时间短。在手性底物中研究了PPA酯的反应机理和作用。
Radical C(sp<sup>2</sup>)–H Trifluoromethylation of Aldehydes in Aqueous Solution
作者:Pei Zhang、Haigen Shen、Lin Zhu、Weiguo Cao、Chaozhong Li
DOI:10.1021/acs.orglett.8b03012
日期:2018.11.16
The copper-mediated C(sp2)–H trifluoromethylation of aldehydes is described. The reaction of aldehydes with (bpy)Cu(CF3)3, Et3SiH, and K2S2O8 in aqueous acetone at room temperature provides the corresponding trifluoromethyl ketones in satisfactory yields. The protocol is applicable to both aliphatic and aromatic aldehydes and exhibits a broad substrate scope and wide functional group compatibility
描述了铜介导的醛的C(sp 2)–H三氟甲基化。在室温下,醛与(bpy)Cu(CF 3)3,Et 3 SiH和K 2 S 2 O 8在丙酮水溶液中的反应以令人满意的产率提供了相应的三氟甲基酮。该协议适用于脂族和芳族醛,并具有广泛的底物范围和广泛的官能团相容性。提出了一种涉及Cu(II)介导的酰基三氟甲基化的机理。