Regioselective construction of diverse and multifunctionalized 2-hydroxybenzophenones for sun protection by indium(<scp>iii</scp>)-catalyzed benzannulation
作者:Hongyun Cai、Likai Xia、Yong Rok Lee
DOI:10.1039/c6cc02381a
日期:——
Highly regioselective synthesis of 2-hydroxybenzophenones via the In(OTf)3-catalyzed formal [2+2+2] and [4+2] benzannulations has been successfully developed and their application as sun protection materials was also evaluated.
Domino reactions of 2-methyl chromones containing an electron withdrawing group with chromone-fused dienes
作者:Jian Gong、Fuchun Xie、Wenming Ren、Hong Chen、Youhong Hu
DOI:10.1039/c1ob06613g
日期:——
Domino reactions of 2-methyl substituted chromones containing an electronwithdrawinggroup at the 3-position with chromone-fused dienes synthesized a diverse range of benzo[a]xanthones and complicated chromone derivatives. These multiple-step reactions result in either two or three new C–C bonds without a transition metal catalyst or an inert atmosphere.
在3位上具有吸电子基团的2-甲基取代的色酮与色酮稠合的二烯的多米诺反应合成了多种苯并[ a ]氧杂蒽酮和复杂的色酮衍生物。这些多步反应可产生两个或三个新的C–C键,而无需过渡金属催化剂或惰性气氛。
Synthesis, Spectral Studies and Antibacterial Activity of 3-(4-Phenyl-2,3-dihydro-1,5-benzodiazepin-2-yl)chromone
作者:Vinay Prabha Sharma、Praveen Kumar
DOI:10.14233/ajchem.2014.16377
日期:——
3-(4-Phenyl-2,3-dihydro-1,5-benzodiazepin-2-yl)chromone (PHBDC) has been synthesized by reacting 1-phenyl-3-(chromon-3-yl)-2-propene-1-one (chalcone) with o-phenylenediamine. Structures of chalcone as well as PHBDC were established on the basis of elemental analysis, IR and PMR spectral studies. 3-(4-Phenyl-2,3-dihydro-1,5-benzodiazepin-2-yl)chromone has been found to be antibacterial against bacillus bacteria some of which cause food poisoning, anthrax (a malignant boil), etc.
Domino Reaction to Functionalized 2-Hydroxybenzophenones from Electron-Deficient Chromones and 1,3-Dicarbonyl Compounds
作者:Hong Chen、Fuchun Xie、Jian Gong、Youhong Hu
DOI:10.1021/jo201384f
日期:2011.10.21
A base-promoted one-pot tandemreaction sequence has been developed to transform electron-deficient chromone-fused dienes 1 and 1,3-dicarbonylcompounds 2 to functionalized 2-hydroxybenzophenones 3 under mild conditions. This domino process, which involves multiple reactions, including Michael addition/cyclization/elimination, serves as an efficient, economic, and eco-friendly method for the construction
Asymmetric Michaelreaction of 3-homoacyl coumarins and chromone-fused dienes was developed by employing a chiral squaramide, and a series of coumarin chromone skeletons were furnished in moderate to high yields (up to 99%) and stereoselectivities (up to 98 : 2 dr, 99% ee).