Iridium-Catalyzed Highly Enantioselective Transfer Hydrogenation of Aryl <i>N</i>-Heteroaryl Ketones with <i>N</i>-Oxide as a Removable <i>ortho</i>-Substituent
作者:Qixing Liu、Chunqin Wang、Haifeng Zhou、Baigui Wang、Jinliang Lv、Lu Cao、Yigang Fu
DOI:10.1021/acs.orglett.7b03878
日期:2018.2.16
A highlyenantioselectivetransferhydrogenation of non-ortho-substituted aryl N-heteroaryl ketones, using readily available chiral diamine-derived iridium complex (S,S)-1f as a catalyst and sodium formate as a hydrogen source in a mixture of H2O/i-PrOH (v/v = 1:1) under ambient conditions, is described. The chiral aryl N-heteroaryl methanols were obtained with up to 98.2% ee by introducing an N-oxide
使用容易获得的手性二胺衍生的铱络合物(S,S)-1f作为催化剂,甲酸钠作为氢源的H 2 O混合物,对非邻位取代的芳基N-杂芳基酮进行高度对映选择性转移氢化/我的i-PrOH(v / v = 1:1)在环境条件下,进行说明。通过引入N-氧化物作为可除去的邻位取代基,获得具有高达98.2%ee的手性芳基N-杂芳基甲醇。相反,在不存在氮的情况下,观察到的ee不超过15.1%-氧化物部分。此外,该协议的实用性还通过克规模的苯磺酸他莫司汀的克级不对称合成以51%的总收率和99.9%的ee进行了证明。
Use of Pyrimidine Derivatives in the Manufacture of a Medicament for Prevention and/or Treatment of Alzheimer's Disease
申请人:Andersson Lars
公开号:US20080214560A1
公开(公告)日:2008-09-04
Pyrimidine derivatives of formula I,
wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
and R
9
are as defined in the specification, as a base or a pharmaceutically acceptable salt thereof in the manufacture of pharmaceutical compositions and in the treatment or prophylaxis of Alzheimer's Disease.
A Nitrogen-Assisted One-Pot Heteroaryl Ketone Synthesis from Carboxylic Acids and Heteroaryl Halides
作者:Krystyna Demkiw、Hirofumi Araki、Eric L. Elliott、Christopher L. Franklin、Yoonjoo Fukuzumi、Frederick Hicks、Kazushi Hosoi、Tadashi Hukui、Yoichiro Ishimaru、Erin O’Brien、Yoshimasa Omori、Masahiro Mineno、Hideya Mizufune、Naotaka Sawada、Yasuhiro Sawai、Lei Zhu
DOI:10.1021/acs.joc.6b00194
日期:2016.4.15
A practical and highly effective one-pot synthesis of versatile heteroaryl ketones directly from carboxylic acids and heteroaryl halides under mild conditions is reported. This method does not require derivatization of carboxylic acids (preparation of acid chlorides, Weinreb amides, etc.) or the use of any additives/catalysts. A wide substrate scope of carboxylic acids with high functional group tolerance
A facile synthetic route for 2-pyridyl derivatives: direct preparation of a stable 2-pyridylzinc bromide and its copper-free and pd-catalyzed coupling reactions
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tetlet.2009.07.004
日期:2009.9
Direct preparation of 2-pyridylzinc bromide has been developed. Interestingly, the subsequent coupling reactions with acid chlorides have been carried out without any transition metal catalyst. 2-Pyridylaryl compounds, symmetrical and unsymmetrical 2,2′-bipyridines were also successfully obtained from palladium-catalyzed coupling reactions of 2-pyridylzinc bromide under mild conditions.
2-Pyridyl and 3-pyridylzinc bromides: direct preparation and coupling reaction
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/j.tet.2010.02.061
日期:2010.4
A facile synthetic approach to the direct preparation of 2-pyridyl and 3-pyridylzinc bromides has been demonstrated usingRieke zinc with 2-bromopyridine and 3-bromopyridine, respectively. A variety of different electrophiles have been coupled with the resulting organozinc reagents to give the corresponding cross-coupling products in moderate to good yields.