Synthesis of 1,2,3,4‐Tetrahydroisoquinolines via Palladium‐Catalyzed Cyclization of
<i>N</i>
‐Tosylhydrazones with
<i>ortho</i>
‐Bromophenethyl Tosylamides
A Pd-catalyzed synthesis of 1,2,3,4-tetrahydroisoquinoline (THIQ) via cyclization of ortho-bromophenethyl tosylamides with aryl N-tosylhydrazones in the presence of base was developed. The reaction is believed to proceed via the oxidative addition of palladium with ortho-bromophenethyl tosylamides, followed by carbene insertion and cyclization. The carbene species were generated in-situ from the aryl
开发了一种 Pd 催化合成 1,2,3,4-四氢异喹啉 (THIQ),方法是在碱存在下邻溴苯乙基甲苯磺酰胺与芳基N-甲苯磺酰腙环化。据信该反应是通过钯与邻-溴苯乙基甲苯磺酰胺的氧化加成反应进行的,然后是卡宾插入和环化。卡宾物种由芳基N-甲苯磺酰腙和 KO t Bu 原位生成。
Palladium/GF-Phos-catalyzed asymmetric carbenylative amination to access chiral pyrrolidines and piperidines
作者:Yue Sun、Chun Ma、Zhiming Li、Junliang Zhang
DOI:10.1039/d2sc03999k
日期:——
but the development of catalyticenantioselective versions still poses considerable challenges and only very limited examples have been reported. We herein report an asymmetric palladium/GF-Phos-catalyzed carbenylative amination reaction of N-tosylhydrazones and (E)-vinyl iodides pendent with amine, which allows facile access to a range of chiral pyrrolidines and piperidines in good yields (45–93%)
N-甲苯磺酰腙的交叉偶联已成为构建结构多样化分子的有效方法,但催化对映选择性版本的开发仍然面临相当大的挑战,并且仅报道了非常有限的例子。我们在此报告了一种不对称钯/GF-Phos催化的N-甲苯磺酰腙和( E )-乙烯基碘化物与胺悬垂的羧基胺化反应,该反应可以轻松获得一系列手性吡咯烷和哌啶,产率良好(45-93%) ) 高达 96.5: 3.5 er 。此外,条件温和、底物范围广泛、制备规模化以及天然产物(−)-norruspoline的高效合成是该方法的实用特点。
Copper-Catalyzed Sulfur Alkylation of Sulfenamides with N-Sulfonylhydrazones
compounds in both organic synthesis and pharmaceuticals. In this study, we present a copper-catalyzed sulfur alkylation of sulfenamides with N-sulfonylhydrazones. In contrast to prior findings, hydrazones derived from aldehydes act as donor-type carbene precursors, effectively engaging in coupling with sulfenamides via a copper catalyst, demonstrating exclusive S selectivity. The utility of the protocol was