Tetrabutylammonium decatungstate (TBADT) promoted the oxidation of hydroxamicacids to nitrosocarbonylintermediates. The reaction took place under aerobic conditions upon irradiation with solar light. The thus generated nitrosocarbonyls were efficiently trapped with reactive dienes to afford the corresponding Hetero Diels‐Alder (HDA) cycloadducts in good yields.
Chemical Upcycling of Waste Poly(bisphenol A carbonate) to 1,4,2‐Dioxazol‐5‐ones and One‐Pot C−H Amidation
作者:Hyun Jin Jung、Sora Park、Hyun Sub Lee、Hyun Gyu Shin、Yeji Yoo、Ek Raj Baral、Jun Hee Lee、Jaesung Kwak、Jeung Gon Kim
DOI:10.1002/cssc.202100885
日期:2021.10.5
poly(bisphenol A carbonate) (PC) was achieved in this study with hydroxamic acid nucleophiles, giving rise to synthetically valuable 1,4,2-dioxazol-5-ones and bisphenol A. Using 1,5,7-triazabicyclo[4.4.0]-dec-5-ene (TBD), non-green carbodiimidazole or phosgene carbonylation agents used in conventional dioxazolone synthesis were successfully replaced with PC, and environmentally harmful bisphenol A was
本研究中使用异羟肟酸亲核试剂实现了聚(双酚 A 碳酸酯)(PC)的化学升级,产生了具有合成价值的 1,4,2-二恶唑-5-酮和双酚 A。使用 1,5,7-三氮杂双环传统二恶唑酮合成中使用的[4.4.0]-dec-5-烯(TBD)、非绿色碳二咪唑或光气羰基化剂成功地被PC替代,同时回收了对环境有害的双酚A。杂异羟肟酸表现出良好的效率和绿色化学特性,具有广阔的合成应用范围。此外,还开发了一种绿色芳基酰胺合成工艺,包括从聚碳酸酯到二恶唑酮的一锅解聚,然后是铑催化的 CH 酰胺化,包括使用光盘的克级实例。
Reaction of Dioxazolones with Boronic Acids: Copper-Mediated Synthesis of <i>N</i>-Aryl Amides via <i>N</i>-Acyl Nitrenes
作者:Abdullahi K. Adegboyega、Jongwoo Son
DOI:10.1021/acs.orglett.2c01837
日期:2022.7.15
The versatility of the developed reaction is proven by ample scope having a wide range of functional group tolerance. The reaction optimization conditions revealed that a fluorine additive demonstrated improved reactivity toward the intended transformation. The addition of triphenylphosphine resulted in N-acyl iminophosphorane, suggesting the involvement of an N-acyl nitrene intermediate.
Ir(<scp>iii</scp>)/Ag(<scp>i</scp>)-catalyzed directly C–H amidation of arenes with OH-free hydroxyamides as amidating agents
作者:Youpeng Zuo、Meijun Liu、Jun Du、Tianren Zhang、Xiaoqing Wang、Cong Wang
DOI:10.1039/d4ra00517a
日期:——
A versatile Ir(III)-catalyzed C–H amidation of arenes by employing readily available and stable OH-free hydroxyamides as a novel amidation source. The reaction occurred with high efficiency and tolerance of a range of functional groups. A wide scope of aryl OH-free hydroxyzamides, including conjugated and challenging non-conjugated OH-free hydroxyzamides, were capable of this transformation and no