Guest Binding Drives Reversible Atropisomerism in Cavitand Hosts
作者:Thanh V. Nguyen、David J. Sinclair、Anthony C. Willis、Michael S. Sherburn
DOI:10.1002/chem.200900695
日期:2009.6.8
Guest‐love‐ometer: The equilibrium inside–outside atropisomeric ratio of ortho‐substituted phenyl cavitands shows a strong solvent dependence. The competition between the ortho‐substituent and the solvent guest for the bowl cavity leads to a sensitive system for the measurement of relative guestbinding affinities.
We disclose the microwave-assisted remote-C–H functionalization aided by a simple nitrile directing template via enabling the meta-C–H arylation, acetoxylation, and cyanation with broad substrate compatibility including drug diversifications.
ABSTRACT A practical copper-catalyzed I-substitutions of alkyl-2-iodobenzoates with alkynes have been developed using Cu powder as a catalyst under solvent, cocatalyst, and base-free conditions. This reaction system is new, facile, efficient, and economical that gives Sonogashira coupling products in excellent yields (up to 97%). The coupled products (A–J) were characterized by CHNS, 1H NMR, and 13C