Abstract
The reactions of β‐lapachone (1) with 1,2‐diaminoethane (2) and 1,2‐diaminopropane (4) gave the tetracyclic pyrazine derivatives (3) and mixtures of (5) and (6), respectively, while reaction with o‐phenylene diamine (7) gave the quinoxaline derivative (8). The structure of pyrazine derivative (3) is confirmed by single‐crystal X‐ray diffraction study.
Acknowledgment
Authors (P. S. and A. D.) are thankful to UGC for financial support. M. B. H. thanks the U.K. Engineering and Physical Sciences Council for support of the X‐ray facilities at Southampton University. J. E. D. thanks the University of Windsor for financial support.