A facile preparation of various N-heterocycles using amides and olefins
作者:Synthia S. Gratia、Edward S. Vigneau、Sumiea Eltayeb、Kishan Patel、Terence J. Meyerhoefer、Sonia Kershaw、Victor Huang、Michael De Castro
DOI:10.1016/j.tetlet.2013.11.054
日期:2014.1
one pot approach for the synthesis of various nitrogen containing heterocycles including: oxazolines, thiazolines, and dihydro dioxazines via the addition of amides to olefins in the presence of N-iodosuccinimide (NIS) and propionitrile at high temperatures. Thus, the reaction of aryl/heteroaryl amides, thioamides, N-hydroxybenzamide, and phenylurea with various olefins in the presence of NIS and propionitrile
The annulation reactions of benzoamidyl radicals with alkenes were realized under visible light irradiation with fac-Ir(ppy)3 as catalyst and N-aminopyridinium salts as benzoamidyl radical precursors. The reaction can deliver two distinct types of products: in the case of vinyl arenes, [3 + 2] annulation product dihydrooxazoles were yielded exclusively; when alkyl-substituted alkenes were used, on the
Callens, R.; Anteunis, M. J. O.; Witte, M. De, Bulletin des Societes Chimiques Belges, 1987, vol. 96, # 8, p. 619 - 622
作者:Callens, R.、Anteunis, M. J. O.、Witte, M. De
DOI:——
日期:——
Visible light bromide catalysis for oxazoline, pyrrolidine, and dihydrooxazine syntheses <i>via</i> C<sub>sp<sup>3</sup></sub>–H functionalizations
作者:Navdeep Kaur、Elizabeth C. Ziegelmeyer、Olutayo N. Farinde、Jonathon T. Truong、Michelle M. Huynh、Wei Li
DOI:10.1039/d1cc04588a
日期:——
(N)-centered radical for a site-selective hydrogenatomtransfer (HAT) process. This strategy enabled the unconventional syntheses of a number of N-heterocycles dependent on the amide identity. We also discovered a nucleophilicity-dependent kinetic resolution for stereochemical differentiation of Csp3–H bonds that enabled the stereoselective synthesis of cis- and trans-oxazolines.
此处描述了催化苄基 C sp 3 –H 功能化协议。这种可见光介导的过程集中在利用溴化物催化剂和氧化剂来生成以氮 (N) 为中心的自由基,用于位点选择性氢原子转移 (HAT) 过程。这种策略使依赖酰胺身份的许多 N-杂环的非常规合成成为可能。我们还发现了 C sp 3 -H 键立体化学分化的亲核依赖性动力学分辨率,这使得顺式和反式恶唑啉的立体选择性合成成为可能。