Strongly Reducing, Visible‐Light Organic Photoredox Catalysts as Sustainable Alternatives to Precious Metals
作者:Ya Du、Ryan M. Pearson、Chern‐Hooi Lim、Steven M. Sartor、Matthew D. Ryan、Haishen Yang、Niels H. Damrauer、Garret M. Miyake
DOI:10.1002/chem.201702926
日期:2017.8.16
Photoredox catalysis is a versatile approach for the construction of challenging covalent bonds under mild reaction conditions, commonly using photoredox catalysts (PCs) derived from precious metals. As such, there is need to develop organic analogues as sustainable replacements. Although several organic PCs have been introduced, there remains a lack of strongly reducing, visible-light organic PCs
光氧化还原催化是一种在温和的反应条件下构建具有挑战性的共价键的通用方法,通常使用衍生自贵金属的光氧化还原催化剂(PC)。因此,需要开发有机类似物作为可持续的替代物。尽管已经引入了几种有机PC,但仍然缺少强烈还原的可见光有机PC。在这里,我们建立了二氢吩嗪和吩恶嗪系统的关键光物理和电化学特性,从而使其能够成功用作三氟甲基化反应以及光氧还蛋白/镍催化的CN和CS交叉偶联的强还原可见光PC。历史上,这两种反应都是贵金属PC独有的。
Preparation of ?,?-Dibromocyclobutanones from Olefins: A simple procedure for the regioselective functionalization of olefins
作者:H�l�ne Chaumeil、Claude Le Drian
DOI:10.1002/hlca.19960790416
日期:1996.6.26
of tribromoacetyl bromide in the presence of POCl3. Under these conditions, the cycloaddition of dibromoketene with olefins 5 yields α,α-dibromocyclobutanones 2, which are cleaved with alkoxides to yield β-dibromomethyl esters 4. Several examples are given. For monosubstituted olefins, the functionalization is regioselective, the methoxycarbonyl group being introduced at the terminal C-atom.
二溴乙烯酮是通过在POCl 3存在下三溴乙酰溴的原位Zn脱卤制备的。在这些条件下,二溴乙烯酮与烯烃5的环加成反应会生成α,α-二溴环丁酮2,后者会被醇盐裂解,生成β-二溴甲基酯4。给出了几个例子。对于单取代的烯烃,官能化是区域选择性的,甲氧基羰基被引入末端C-原子。
Hydrolytic kinetic resolution of terminal mono- and bis-epoxides in the synthesis of insect pheromones: routes to (−)-( R )- and (+)-( S )-10-methyldodecyl acetate, (−)-( R )-10-methyl-2-tridecanone, (−)-( R )-( Z )-undec-6-en-2-ol (Nostrenol), (−)-(1 R ,7 R )-1,7-dimethylnonyl propanoate, (−)-(6 R ,12 R )-6,12-dimethylpentadecan-2-one, (−)-(2 S ,11 S )-2,11-diacetoxytridecane and (+)-(2 S ,12 S )-2,12-diacetoxytridecane
作者:Sharon Chow、William Kitching
DOI:10.1016/s0957-4166(02)00175-1
日期:2002.5
enantiomerically enriched epoxides and diols, which have been transformed into important insect sex pheromones. In this general approach, (−)-(R)- and (+)-(S)-10-methyldodecyl acetates from the smaller tea tortrix moth were obtained, as was (−)-(R)-10-methyltridecan-2-one from the southern corn rootworm. The (S)-epoxide obtained from undec-1-en-6-yne was transformed to (−)-(R)-(Z)-undec-6-en-2-ol (Nostrenol)
使用(salen)Co(OAc)配合物的官能化环氧化物的水解动力学拆分(HKR)提供了对映体富集的环氧化物和二醇,它们已转化为重要的昆虫性信息素。在这种通用方法中,从较小的茶to蛾中获得了(-)-(R)-和(+)-(S)-10-甲基十二烷基乙酸酯,以及(-)-(R)-10-甲基叔丁基酚2 -来自南部玉米根虫的一种。从十一烯-1-烯-6-炔获得的(S)-环氧化物从蚁狮转变为(-)-(R)-(Z)-十一烯-6-烯-2-醇(Nostrenol)。还研究了合适的双环氧化物的HKR,并提供了生成的双环氧化物和环氧二醇的转化(-)-(1 R,7 - [R )从玉米根-1,7- dimethylnonylpropanoate,( - ) - (6 - [R,12 - [R)-6,12-dimethylpentadecan -2-酮从阴带状黄瓜甲虫,和( - ) - (2-小号来自雌豌豆mid的,11 S