Chlorinated compounds are useful intermediates in many organic synthetic reactions. A variety of biologically active natural products have chlorine atoms in their structure. Thus, chlorination of alcohols has been studied and used in organic chemistry for decades. Chlorination of benzyl alcohols is also a topic of interest because benzylchlorides can be used as im-portant synthons in organic synthesis
elimination of hydrogen chloride from amide or sulfonamide derivatives of o-(chloromethyl)aniline, has never been reported. This powerful approach provides easy and stereoselective access to polycyclic hydroquinolines, as shown for an example in Equation (1).
DBU-Promoted Formal [4+2] Annulation Reactions of o-Chloromethyl Anilines with Azlactones
作者:Jianfeng Xu、Haojie Ji、Chonglong He、Hongjie Gao、Weijun Fu
DOI:10.1055/s-0040-1706549
日期:2021.4
An efficient 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)-mediated formal [4+2] annulation reaction of aza-ortho-quinone methides (aza-oQMs) (generated from o-chloromethyl anilines) with enolates (formed from azlactones) is disclosed, delivering biologically significant 3,4-dihydroquinolin-2(1H)-one derivatives in moderate to good yields. The salient features of this reaction include readily accessible
N-Heterocyclic-Carbene-Catalyzed Synthesis of 2-Aryl Indoles
作者:M. Todd Hovey、Christopher T. Check、Alexandra F. Sipher、Karl A. Scheidt
DOI:10.1002/anie.201405035
日期:2014.9.1
A convergent and efficient transition‐metal‐free catalytic synthesis of 2‐aryl‐indoles has been developed. The interception of a highly reactive and transient aza‐ortho‐quinonemethide by an acyl anion equivalent generated through N‐hetereocyclic carbene catalysis is central to this successful strategy. High yields and a wide scope as well as the streamlined synthesis of a kinase inhibitor are reported
Efficient construction of a challenging aza-spirocycloheptane oxindole scaffold is reported through an unprecedented [4 + 3] cycloaddition reaction with bromo-substituted Morita–Baylis–Hillman adducts of isatins and N-(ortho-chloromethyl)arylamides. Both reactive intermediates, the allylic phosphonium ylides and aza-o-quinone methides, were in situ generated, chemoselectively facilitated by a Lewis