4634-12-2Relevant articles and documents
Site-selective direct C-H pyridylation of unactivated alkanes by triplet excited anthraquinone
Lee, Wooseok,Jung, Sungwoo,Kim, Minseok,Hong, Sungwoo
supporting information, p. 3003 - 3012 (2021/03/01)
Site-selective C-H functionalization in chemical feedstocks is a challenging and useful reaction in the broad field of chemical research. Here, we report a modular photochemical platform for the site-selective C-H pyridylation of unactivated hydrocarbons via the unique synergistic effects of triplet excited anthraquinone and an amidyl radical-based reverse hydrogen atom transfer (RHAT) agent. The selective pyridylation of tertiary and secondary C(sp3)-H bonds in abundant chemical feedstocks was achieved by employing various N-aminopyridinium salts in a highly selective fashion, thus providing a new catalytic system for the direct construction of high-value-added compounds under ambient reaction conditions. Moreover, this operationally simple protocol is applicable to a variety of linear-, branched-, and cyclo-alkanes and more complex molecules with high degrees of site selectivity under visible-light conditions, which provides rapid and straightforward access to versatile synthons for upgrading feedstocks under mild, metal-free reaction conditions.
ALKOXYBENZO-FIVE-MEMBERED (SIX-MEMBERED) HETEROCYCLIC AMINE COMPOUND AND PHARMACEUTICAL USE THEREOF
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Paragraph 0052-0054; 0121-0123, (2020/12/22)
The invention relates to alkoxybenzeno five- or six-member heterocyclic amines compounds as scheme I , in which the R1, R2 and R3 are consistent with the detailed description in the patent claim. The compounds can act as selective sphingomyelin synthase 2 (SMS2) inhibitors to treat diseases caused by abnormal increasing of sphingomyelin (SM). This invention also includes compounds as scheme I , including pharmaceutically acceptable salts, pharmaceutical compositions as the active ingredients, and their application in drugs which can prevent and cure diseases caused by abnormal increasing of SM. These diseases caused by abnormal increasing of SM include atherosclerosis, type II diabetes, fatty liver, obesity, metabolic syndromes, enteritis and other inflammatory diseases.
Spin-Center Shift-Enabled Direct Enantioselective α-Benzylation of Aldehydes with Alcohols
Nacsa, Eric D.,MacMillan, David W. C.
supporting information, p. 3322 - 3330 (2018/03/13)
Nature routinely engages alcohols as leaving groups, as DNA biosynthesis relies on the removal of water from ribonucleoside diphosphates by a radical-mediated "spin-center shift" (SCS) mechanism. Alcohols, however, remain underused as alkylating agents in synthetic chemistry due to their low reactivity in two-electron pathways. We report herein an enantioselective α-benzylation of aldehydes using alcohols as alkylating agents based on the mechanistic principle of spin-center shift. This strategy harnesses the dual activation modes of photoredox and organocatalysis, engaging the alcohol by SCS and capturing the resulting benzylic radical with a catalytically generated enamine. Mechanistic studies provide evidence for SCS as a key elementary step, identify the origins of competing reactions, and enable improvements in chemoselectivity by rational photocatalyst design.
