Visible-Light-Induced Tandem Radical Addition–Cyclization of Alkenyl Aldehydes Leading to Indanones and Related Compounds
作者:Danyang Lu、Yimei Wan、Lichun Kong、Gangguo Zhu
DOI:10.1021/acs.orglett.7b01162
日期:2017.6.2
Herein we describe a novel, visible light-induced tandemradicaladdition–cyclization of alkenyl aldehydes with α-bromocarbonyl compounds. A set of cyclic ketones, including indanones, cyclopentenones, 3,4-dihydronaphthalen-1(2H)-ones, and chroman-4-ones, are synthesized at room temperature with high efficiency and good functional group compatibility. It represents the first report on the catalytic
Zn(OH)2-catalyzed allylation reactions of allylboronates with aldehydes proceeded smoothly in aqueous media; when α-substituted allylboronates were employed, the α-addition products were obtained exclusively, and syn-adducts were formed selectively in most cases; the use of Zn(OH)2 with dmp (ligand) in aqueous media is the key to these reactions.
Zn-Catalyzed Asymmetric Allylation for the Synthesis of Optically Active Allylglycine Derivatives. Regio- and Stereoselective Formal α-Addition of Allylboronates to Hydrazono Esters
have developed Zn-catalyzed asymmetricallylation of hydrazonoesters with allylboronates. The reactions proceeded smoothly in high yields and high stereoselectivities. Remarkably, formal α-addition occurred for α-substituted allylboronates exclusively, and excellent stereoselectivities were observed. This is the first example of catalytic regio- and stereoselective allylations with formal α-addition.