Tandem O–H Insertion/[1,3]-Alkyl Shift of Rhodium Azavinyl Carbenoids with Benzylic Alcohols: A Route To Convert C–OH Bonds into C–C Bonds
作者:Pengbing Mi、Rapolu Kiran Kumar、Peiqiu Liao、Xihe Bi
DOI:10.1021/acs.orglett.6b02459
日期:2016.10.7
Alcohols are among the most abundant and commonly used organic feedstock in industrial processes and academic research. The first tandem O–H insertion/[1,3]-alkyl shift reaction reported is between benzylicalcohols and rhodium azavinyl carbenoids derived from N-sulfonyl-1,2,3-triazoles, which provides a strategically novel way of cleaving C–OH bonds and forming C–C bonds. The substrate scope is broad
Lithium-Catalyzed Thiol Alkylation with Tertiary and Secondary Alcohols: Synthesis of 3-Sulfanyl-Oxetanes as Bioisosteres
作者:Rosemary A. Croft、James J. Mousseau、Chulho Choi、James A. Bull
DOI:10.1002/chem.201705576
日期:2018.1.19
inexpensive Li catalyst enables chemoselective C-OH activation and thiol alkylation. Oxetane sulfides are formed from various thiols providing novel motifs in new chemical space and specifically as bioisosteres for thioesters due to their similar shape and electronic properties. Under the same conditions, various π-activated secondary and tertiary alcohols are also successful. Derivatization of the oxetane
3-硫烷基-氧杂环丁烷被认为是硫酯或苯硫醚的有前途的新型生物电子等排替代品。一种温和且廉价的 Li 催化剂以 oxetan-3-ols 为原料,能够实现化学选择性 C-OH 活化和硫醇烷基化。氧杂环丁烷硫化物由各种硫醇形成,在新的化学空间中提供新颖的基序,并且由于其相似的形状和电子特性,特别是作为硫酯的生物等排体。在相同条件下,各种π活化的仲醇和叔醇也获得了成功。氧杂环丁烷硫化物连接体的衍生化提供了更多新颖的氧杂环丁烷类别和结构单元。氧杂环丁烷化合物与选定的羰基和亚甲基类似物的关键物理化学性质的比较表明,这些基序适合纳入药物发现工作。
Catalytic Friedel‐Crafts Reactions on Saturated Heterocycles and Small Rings for sp
<sup>3</sup>
‐sp
<sup>2</sup>
Coupling of Medicinally Relevant Fragments
作者:Rosemary A. Croft、Maryne A. J. Dubois、Alexander J. Boddy、Camille Denis、Anna Lazaridou、Anne Sophie Voisin‐Chiret、Ronan Bureau、Chulho Choi、James J. Mousseau、James A. Bull
DOI:10.1002/ejoc.201900498
日期:2019.9
A systematic comparison of Lewis acid catalysts [Ca(II), Li(I) and Fe(III)] is presented for catalytic Friedel–Crafts reactions using alcohols on 4‐, 5‐, and 6‐membered oxygen and nitrogen heterocycles and cyclobutanes, forming gem‐diaryl quaternary centers.
Alkylsilyl Peroxides as Alkylating Agents in the Copper-Catalyzed Selective Mono-<i>N</i>
-Alkylation of Primary Amides and Arylamines
作者:Ryu Sakamoto、Shunya Sakurai、Keiji Maruoka
DOI:10.1002/chem.201702217
日期:2017.7.6
alkylsilyl peroxides as alkylating agents is reported. The reaction proceeds under mild reaction conditions and exhibits a broad substrate scope with respect to the alkylsilyl peroxides, as well as to the primary amides and arylamines. Mechanistic studies suggest that the present reaction should proceed through a free-radical process that includes alkyl radicals generated from the alkylsilyl peroxides.
An electrophotochemical ring-opening bromination of unstrained tert-cycloalkanols has been developed. This electrophotochemical method enables the oxidative transformation of cycloalkanols with 5- to 7-membered rings into synthetically useful ω-bromoketones without the use of chemical oxidants or transition-metal catalysts. Alkoxy radical species would be key intermediates in the present transformation