Potassium Alkylpentafluorosilicates, Primary Alkyl Radical Precursors in the C-1 Alkylation of Tetrahydroisoquinolines
作者:Teng Wang、Dong-Hui Wang
DOI:10.1021/acs.orglett.9b01124
日期:2019.6.7
alkylpentafluorosilicates (RSiF5K2) are efficient primary alkyl radical precursors for selective C(sp3)–C(sp3) bond-forming reactions. RSiF5K2 reagents are white, free-flowing solids and are moisture and air stable. This class of reagents enables the direct C-1 alkylation of tetrahydroisoquinolines under mild conditions via single-electron transfer. The broad substrate scope of both alkylpentafluorosilicates and
在这项研究中,我们证明了烷基五氟硅酸钾(RSiF 5 K 2)是选择性C(sp 3)–C(sp 3)键形成反应的有效伯烷基自由基前体。RSiF 5 K 2试剂是白色的,可自由流动的固体,对湿气和空气稳定。这类试剂可在温和条件下通过单电子转移将四氢异喹啉直接C-1烷基化。在该转化中,烷基五氟硅酸盐和四氢异喹啉都具有宽泛的底物范围。自由基清除剂和EPR捕获实验均表明,主要自由基是由RSiF 5 K 2的氧化产生的。提出了一种机制,该机制涉及将烷基自由基加到亚胺盐中,然后用胺还原。
Copper-Catalyzed Cyanomethylation of Substituted Tetrahydroisoquinolines with Acetonitrile
作者:Wei Zhang、Shiping Yang、Zengming Shen
DOI:10.1002/adsc.201600050
日期:2016.7.28
A novel method for the synthesis of cyanomethylated tetrahydroisoquinolines has been developed with mild reaction conditions, good yields and a broad substrate scope. Acetonitrile, a common solvent, is for the first time used as a pronucleophile for this type of two sp3 C−H bonds cross‐dehydrogenative coupling (CDC) reaction. A new oxidative system (CuCl2/TEMPO/Cs2CO3) has been established by our group
已经开发了一种温和的反应条件,良好的收率和广泛的底物范围的合成氰基甲基化四氢异喹啉的新方法。乙腈是一种常见的溶剂,首次被用作此类两个sp 3 C H键交叉脱氢偶联(CDC)反应的亲核试剂。我们的小组已经建立了一种新的氧化系统(CuCl 2 / TEMPO / Cs 2 CO 3),其中发现温和的TEMPO试剂是一种高效的氧化剂。
Visible-light promoted allylation of N-substituted tetrahydroisoquinoline using riboflavin tetra-acetate as photocatalyst
unique isoalloxazine structure unit with special photoredox capacity makes it applicable to induce single electron transfer (SET) oxidation of organic molecules. We report here that riboflavin tetra-acetate (RFTA) catalyzed the oxidation of N-phenyl tetrahydroisoquinoline to α-amino C-radical which subsequently undergoes radical type Michael addition to CC double bond of allylsulfone to access 1-allylated
核黄素(RF)和相关衍生物是一些氧化还原酶的重要辅酶,通过收集光来控制植物的生长发育。具有特殊光氧化还原能力的独特异咯嗪结构单元使其适用于诱导有机分子的单电子转移(SET)氧化。我们在此报告,核黄素四乙酸酯 (RFTA) 催化N-苯基四氢异喹啉氧化为 α-氨基 C-自由基,随后对烯丙基砜的C C 双键进行自由基型迈克尔加成以获得 1-烯丙基化N-苯基四氢异喹啉。
Chiral organic contact ion pairs in metal-free catalytic enantioselective oxidative cross-dehydrogenative coupling of tertiary amines to ketones
作者:Gen Zhang、Yunxia Ma、Shoulei Wang、Weidong Kong、Rui Wang
DOI:10.1039/c3sc50604e
日期:——
A novel chiral organic contact ion-pair catalytic system has been developed for the transition-metal-free catalytic enantioselective oxidative cross-dehydrogenative coupling of tertiary amines to ketones for sp3 C–H functionalization. This new strategy provides an efficient and environmentally friendly way to access diversify optically active C1-alkylated tetrahydroisoquinoline derivatives from simple starting materials under mild conditions.