我们报告了一种使用大气 O 2作为终端氧化剂的四氢咔啉和四氢-β-咔啉的安全且方便的开瓶铜催化选择性氧化/功能化方法。该体系适用于四氢-β-咔啉的氧化重排,四氢咔啉氧化成α-烷氧基咔唑和螺氧吲哚,以及Witkop氧化。机械实验表明,单电子氧化过程负责可调选择性控制。这种铜催化协议代表了吲哚氧化领域的重大进步。
Herein, we report a biomimeticoxidativecoupling cyclization strategy for the highly efficient functionalization of tetrahydrocarbolines (THCs). This process enables rapid access to complex isochromanoindolenine scaffolds in moderate to excellent yields. The reaction proceeds smoothly and rapidly (complete within minutes) in an open flask. This operationally simple protocol is scalable and compatible
TCCA-mediated oxidative rearrangement of tetrahydro-β-carbolines: facile access to spirooxindoles and the total synthesis of (±)-coerulescine and (±)-horsfiline
作者:Manda Sathish、Akash P. Sakla、Fabiane M. Nachtigall、Leonardo S. Santos、Nagula Shankaraiah
DOI:10.1039/d1ra02381k
日期:——
Multi-reactive centered reagents are beneficial in chemical synthesis due to their advantage of minimal material utilization and formation of less by-products. Trichloroisocyanuric acid (TCCA), a reagent with three reactive centers, was employed in the synthesis of spirooxindoles through the oxidative rearrangement of various N-protected tetrahydro-β-carbolines. In this protocol, low equivalents of
We describe iron‐catalyzed oxidativecouplingcyclization of tetrahydrocarbazoles or THβCs or THγCs to form benzofuroindolenines as fused polycyclic indoles. This mild, efficient and simple approach afforded a library of more than 52 complex compounds across a range of substrate classes with good to excellent yields.
Oxidation of Tetrahydro-β-carbolines by Persulfate
作者:Haijun Chen、Fu Ye、Jing Luo、Yu Gao
DOI:10.1021/acs.orglett.9b02772
日期:2019.9.20
The development of persulfate-mediated oxidation of tetrahydro-β-carbolines is reported. This mild reaction facilitates the formation of a variety of 2-formyl N-substituted tryptamines and the related derivatives as key intermediates in moderate to excellent yields. The method is applicable to direct last-stage oxidation of two interesting pharmaceuticals, Cialis and evodiamine.