Organocatalytic hydrogen bond donor/Lewis base (HBD/LB) synthesis and chiroptical properties of thiabridged [5]helicenes

Abstract

Thiabridged [5]helicenes are obtained from thioary-N-phthalimido benzo[a]phenothiazines using a Hydrogen Brond Donor/Lewis Base organocatalytic approach. Resolution of [5]helicenes using either (1S)-(−)-camphanic acid as chiral auxiliary or CSP-HPLC is reported. Thiabridged...